Blackening copper
I need to turn a bit of copper foil black. I have less than 1 square foot to
treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog |
Blackening copper
Roger Jensen wrote:
I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... I researched how to patina cast bronze black recently, didn't come up with anything. I wound up using a dark brown instead, looks OK. - GWE |
Blackening copper
I need to turn a bit of copper foil black. I have less than 1 square foot
to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog This is a VERY old memory going back to 8th grade art class, so don't take it as gospel, but as I recall it was sulfuric acid that would put a nearly black patina on copper. Then use vinegar do stop it and neutralize the acid. As I said, please just use this a starting point...it might be the right stuff, but then again, it might not. Mike |
Blackening copper
I don't see how vinegar would neutralize an acid since vinegar is an acid,
isn't it? "The Davenport's" wrote in message ... I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog This is a VERY old memory going back to 8th grade art class, so don't take it as gospel, but as I recall it was sulfuric acid that would put a nearly black patina on copper. Then use vinegar do stop it and neutralize the acid. As I said, please just use this a starting point...it might be the right stuff, but then again, it might not. Mike |
Blackening copper
Try a Froogle search for " black patina on copper " , many choices.
Bruce "Roger Jensen" wrote in message m... I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog |
Blackening copper
Liver of Sulphur, from a craft shop.
Steve R. "Roger Jensen" wrote in message m... I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog |
Blackening copper
In article ,
"User Example" wrote: I don't see how vinegar would neutralize an acid since vinegar is an acid, isn't it? Did you miss this part of his post? This is a VERY old memory going back to 8th grade art class, so don't take it as gospel But yeah, you're right that vinegar (acetic acid) won't neutralize sulphuric acid worth diddly. Lye, baking soda, crushed limestone or gypsum (or all of the above, if you like) would do a good job of it, but one would want to be *REAL* careful, particularly with the lye, to avoid getting it flung back in one's face by the reaction. And sulphur figures into the equation, but I can't recall how. All I remember is that the stuff we used when we did copper impresssions (I think mine was about 6th grade - Not sure. I remember that I did a motorcycle, though :) ) stunk to hell and gone of sulphur. Had to do that part outside on the benches around the courtyard, the stench was so bad. It ws safe enough to give to youngsters our age, so it couldn't have been *TOO* toxic beyond the smell. Hmmm... on second thought, that *WAS* 25 years ago... When kids routinely did things like "chickenfights" on the monkey bars, shooting off model rockets, swimmming in GASP! The River, shooting the bejeezus out of the blackbird and crow population for miles around, and similar things that we now know are life-threatening activities sure to lead to the extinction of the human race. Who is it with the .sig that mentions "Used to be we made things a boy could lose a couple fingers on"? :) -- Don Bruder - - If your "From:" address isn't on my whitelist, or the subject of the message doesn't contain the exact text "PopperAndShadow" somewhere, any message sent to this address will go in the garbage without my ever knowing it arrived. Sorry... http://www.sonic.net/~dakidd for more info |
Blackening copper
Bruce Johnstone wrote:
Try a Froogle search for " black patina on copper " , many choices. Bruce "Roger Jensen" wrote in message m... I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog What?.... No Marines in the group? Ask any jarhead about brass black~ I truely believe it would do the trick... And Semper Fi, guys.... Bill |
Blackening copper
Try liver of sulphur, but don't leave it on long or the oxide will get
too thick and flake off. Richard Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog -- http://www.fergusonsculpture.com Sculptures in copper and other metals |
Blackening copper
I have "THE BOOK" on that - and have lots of blacks. How black -
Which black? ! Semi-matte/matte Variegated black Semi-matte Dark slate with purplish tint Purplish-black black dark reddish brown black dark slate black semi-gloss dark slate/blue-black Blue-black Gloss Black semi-matte Black semi matte (2) Dark brown/black Black / dark slate and several more pages.. Give me an idea of what black - is it for ? and I'll give out one. This book "The Colouring, Bronzing and Patination of Metals" Richard Hughes $53.55 Amazon.com lcccn 90-498660 Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Blackening copper
"Roger Jensen" wrote in message m... I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Mix and heat the sulphur into 10 parts turpentine until it is dissolved completely. Brush lightly onto clean copper. Heat the copper SLOWLY until black. |
Blackening copper
"Don Bruder" wrote in message ... In article , "User Example" wrote: I don't see how vinegar would neutralize an acid since vinegar is an acid, isn't it? Did you miss this part of his post? This is a VERY old memory going back to 8th grade art class, so don't take it as gospel But yeah, you're right that vinegar (acetic acid) won't neutralize sulphuric acid worth diddly. Lye, baking soda, crushed limestone or gypsum (or all of the above, if you like) would do a good job of it, but one would want to be *REAL* careful, particularly with the lye, to avoid getting it flung back in one's face by the reaction. Gypsum is just calcium sulfate isn't it? If so, it's already a salt and won't act as a neutralizer. And sulphur figures into the equation, but I can't recall how. All I remember is that the stuff we used when we did copper impresssions (I think mine was about 6th grade - Not sure. I remember that I did a motorcycle, though :) ) stunk to hell and gone of sulphur. Had to do that part outside on the benches around the courtyard, the stench was so bad. It ws safe enough to give to youngsters our age, so it couldn't have been *TOO* toxic beyond the smell. Hmmm... on second thought, that *WAS* 25 years ago... When kids routinely did things like "chickenfights" on the monkey bars, shooting off model rockets, swimmming in GASP! The River, shooting the bejeezus out of the blackbird and crow population for miles around, and similar things that we now know are life-threatening activities sure to lead to the extinction of the human race. Who is it with the .sig that mentions "Used to be we made things a boy could lose a couple fingers on"? :) -- Don Bruder - - If your "From:" address isn't on my whitelist, or the subject of the message doesn't contain the exact text "PopperAndShadow" somewhere, any message sent to this address will go in the garbage without my ever knowing it arrived. Sorry... http://www.sonic.net/~dakidd for more info |
Blackening copper
In article ,
"Mike Henry" wrote: "Don Bruder" wrote in message ... In article , "User Example" wrote: I don't see how vinegar would neutralize an acid since vinegar is an acid, isn't it? Did you miss this part of his post? This is a VERY old memory going back to 8th grade art class, so don't take it as gospel But yeah, you're right that vinegar (acetic acid) won't neutralize sulphuric acid worth diddly. Lye, baking soda, crushed limestone or gypsum (or all of the above, if you like) would do a good job of it, but one would want to be *REAL* careful, particularly with the lye, to avoid getting it flung back in one's face by the reaction. Gypsum is just calcium sulfate isn't it? D'OH!!! Where the heck did I get that? You are indeed correct. If so, it's already a salt and won't act as a neutralizer. Yep, absolutely true. My brain-fart. Thanks fer "keepin' me honest". :) -- Don Bruder - - If your "From:" address isn't on my whitelist, or the subject of the message doesn't contain the exact text "PopperAndShadow" somewhere, any message sent to this address will go in the garbage without my ever knowing it arrived. Sorry... http://www.sonic.net/~dakidd for more info |
Blackening copper
Sulfuric acid will clean the oxide off the copper and it will be bright and
probably frosty. If I remember correctly it's liver of sulfur your talking about and yes it stinks. Don't remember it's chemical name and don't remember if it turns copper black. Karl "Don Bruder" wrote in message ... In article , "User Example" wrote: I don't see how vinegar would neutralize an acid since vinegar is an acid, isn't it? Did you miss this part of his post? This is a VERY old memory going back to 8th grade art class, so don't take it as gospel But yeah, you're right that vinegar (acetic acid) won't neutralize sulphuric acid worth diddly. Lye, baking soda, crushed limestone or gypsum (or all of the above, if you like) would do a good job of it, but one would want to be *REAL* careful, particularly with the lye, to avoid getting it flung back in one's face by the reaction. And sulphur figures into the equation, but I can't recall how. All I remember is that the stuff we used when we did copper impresssions (I think mine was about 6th grade - Not sure. I remember that I did a motorcycle, though :) ) stunk to hell and gone of sulphur. Had to do that part outside on the benches around the courtyard, the stench was so bad. It ws safe enough to give to youngsters our age, so it couldn't have been *TOO* toxic beyond the smell. Hmmm... on second thought, that *WAS* 25 years ago... When kids routinely did things like "chickenfights" on the monkey bars, shooting off model rockets, swimmming in GASP! The River, shooting the bejeezus out of the blackbird and crow population for miles around, and similar things that we now know are life-threatening activities sure to lead to the extinction of the human race. Who is it with the .sig that mentions "Used to be we made things a boy could lose a couple fingers on"? :) -- Don Bruder - - If your "From:" address isn't on my whitelist, or the subject of the message doesn't contain the exact text "PopperAndShadow" somewhere, any message sent to this address will go in the garbage without my ever knowing it arrived. Sorry... http://www.sonic.net/~dakidd for more info |
Blackening copper
Martin,
Semi gloss... thanks, rog "Martin H. Eastburn" wrote in message ... I have "THE BOOK" on that - and have lots of blacks. How black - Which black? ! Semi-matte/matte Variegated black Semi-matte Dark slate with purplish tint Purplish-black black dark reddish brown black dark slate black semi-gloss dark slate/blue-black Blue-black Gloss Black semi-matte Black semi matte (2) Dark brown/black Black / dark slate and several more pages.. Give me an idea of what black - is it for ? and I'll give out one. This book "The Colouring, Bronzing and Patination of Metals" Richard Hughes $53.55 Amazon.com lcccn 90-498660 Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Blackening copper
Karl Vorwerk wrote:
Sulfuric acid will clean the oxide off the copper and it will be bright and probably frosty. If I remember correctly it's liver of sulfur your talking about and yes it stinks. Don't remember it's chemical name and don't remember if it turns copper black. Karl I believe it is hydrogen sulfide |
Blackening copper
"Karl Vorwerk" wrote in message ... Sulfuric acid will clean the oxide off the copper and it will be bright and probably frosty. If I remember correctly it's liver of sulfur your talking about and yes it stinks. Don't remember it's chemical name and don't remember if it turns copper black. Karl THAT'S IT!!! Thanks, Karl...I just KNEW that sulfur was in there somewhere! I guess it's been a LOT longer going back to 8th grade than I thought...I'll blame it on the drugs...yeah, that's the ticket...aspirin will do it every time. : Mike |
Blackening copper
One way to get these chemicals - if you know a druggist - or a chemical company...
A druggist can order these in small liter sized bottles - or less. I say take this - as the real names are here - the real purpose is here and you might not have to worry with permission blank from the FBI or Homeland Security... The first is IIRC used in a photo lab - I want to say developer - not sure. Been a while since I taught that! Ferric Nitrate - just have to order. Not simple off the shelf stuff. I don't think a ranch and farm supply would have either. Here goes - and good luck. The book is expensive - in a way - but 360+ pages of data - most of it like this : " Copper / Copper Plate Black 3.111 Black Semi-gloss Sodium Thiosulphate 50 gm Ferric Nitrate 12.5 gm Water 1 liter HOT Immersion (Twenty Minutes) [ bad info first :-) If the temp is to high the color layer will be patchy and more fragile when removed from solution, revealing a tan color beneath the black. ] Method : The article is immersed into the hot solution - 60-70C - and after about 1 minute the surface is colored with a purple-blue luster, which gradually recedes. After 5 minutes a brown color slowly appears which changes to a slate Grey with continued immersion. After about twenty minutes the article is removed, washed in hot water and allowed to dry in air. The surface may be fragile at this stage and should be handled as little as possible. When completely dry the article is wax finished. " quote from page 190 "The Coloring, Bronzing and Pagination of Metals" ================================================== ======================= (spelling changed from British English to American English ) Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder Roger Jensen wrote: Martin, Semi gloss... thanks, rog "Martin H. Eastburn" wrote in message ... I have "THE BOOK" on that - and have lots of blacks. How black - Which black? ! Semi-matte/matte Variegated black Semi-matte Dark slate with purplish tint Purplish-black black dark reddish brown black dark slate black semi-gloss dark slate/blue-black Blue-black Gloss Black semi-matte Black semi matte (2) Dark brown/black Black / dark slate and several more pages.. Give me an idea of what black - is it for ? and I'll give out one. This book "The Colouring, Bronzing and Patination of Metals" Richard Hughes $53.55 Amazon.com lcccn 90-498660 Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Blackening copper
For Brass, I've tried liver of Sulfur, and several Selenium salt or
acid compounds from hobby stores, which give varying shades of very non-uniform brown or mottled black finish. Gun blueing is a stronger Selenium compound, and unless wiped and removed very quickly, produces a nasty black smut. Start over. Some practice will yield not a bad finish on small parts, but on a sheet like that? I suspect that a combo of heat, perhaps molten blueing salts, and/or fumes of something might just work ok on a very diligently cleaned surface, but no guarantees. I've seen some really nice looking Chelsea clock dials (blackened brass), but can't come close to replicating it myself.. / mark Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog |
Blackening copper
Don Bruder wrote:
snipped And sulphur figures into the equation, but I can't recall how. All I remember is that the stuff we used when we did copper impresssions (I think mine was about 6th grade - Not sure. I remember that I did a motorcycle, though :) ) stunk to hell and gone of sulphur. Had to do that part outside on the benches around the courtyard, the stench was so bad. It ws safe enough to give to youngsters our age, so it couldn't have been *TOO* toxic beyond the smell. Odds are that you were using "Liver of Sulfur" (POTASH SULFURATED). It's been the standard stuff for darkening copper and bronze for donkey's ages now. I bought some a few years ago from a crafts supply shop. It came in powder form, to be mixed with water. And yes, it does have a very farty smell to it. It does a good job of "antiquing" copper and brass stuff, and can't be too hazardous, as I've gotten it on my fingers plenty of times for a minute or so, and they didn't fall off or anything. Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "Truth exists; only falsehood has to be invented." |
Blackening copper
If by farty you mean like rotten eggs or a cold catalytic converter then
that would be H2S hydrogen sulphide gas which is poisonous. I would use it in a well ventilated room. Might be one of those that if you can smeel it then its not too concentrated and at a relatively safe concentration. Jeff Wisnia wrote: Don Bruder wrote: snipped And sulphur figures into the equation, but I can't recall how. All I remember is that the stuff we used when we did copper impresssions (I think mine was about 6th grade - Not sure. I remember that I did a motorcycle, though :) ) stunk to hell and gone of sulphur. Had to do that part outside on the benches around the courtyard, the stench was so bad. It ws safe enough to give to youngsters our age, so it couldn't have been *TOO* toxic beyond the smell. Odds are that you were using "Liver of Sulfur" (POTASH SULFURATED). It's been the standard stuff for darkening copper and bronze for donkey's ages now. I bought some a few years ago from a crafts supply shop. It came in powder form, to be mixed with water. And yes, it does have a very farty smell to it. It does a good job of "antiquing" copper and brass stuff, and can't be too hazardous, as I've gotten it on my fingers plenty of times for a minute or so, and they didn't fall off or anything. Jeff |
Blackening copper
No problem. I noticed that someone else knew the answer also. A very
eclectic group, or that could be eccentric. Karl "The Davenport's" wrote in message ... "Karl Vorwerk" wrote in message ... Sulfuric acid will clean the oxide off the copper and it will be bright and probably frosty. If I remember correctly it's liver of sulfur your talking about and yes it stinks. Don't remember it's chemical name and don't remember if it turns copper black. Karl THAT'S IT!!! Thanks, Karl...I just KNEW that sulfur was in there somewhere! I guess it's been a LOT longer going back to 8th grade than I thought...I'll blame it on the drugs...yeah, that's the ticket...aspirin will do it every time. : Mike |
Blackening copper
Blacken-It. Available at better hobby shops or http://www.micromark.com sold in IIRC 4 oz bottles Norm |
Blackening copper
On Sun, 13 Nov 2005 17:18:17 -0600, with neither quill nor qualm, "The
Davenport's" quickly quoth: "Karl Vorwerk" wrote in message ... Sulfuric acid will clean the oxide off the copper and it will be bright and probably frosty. If I remember correctly it's liver of sulfur your talking about and yes it stinks. Don't remember it's chemical name and don't remember if it turns copper black. Karl THAT'S IT!!! Thanks, Karl...I just KNEW that sulfur was in there somewhere! I guess it's been a LOT longer going back to 8th grade than I thought...I'll blame it on the drugs...yeah, that's the ticket...aspirin will do it every time. : I recently ordered 4oz of Liver of Sulphur from www.dickblick.com for $2.89. Minimum shipping is $7.98, so buy a few other goodies, too, to amortize costs. -- CAUTION: Driver brakes for Pukey Ducks (To ignite them.) |
Blackening copper
You can get that by heating the copper in a nitrous oxide
atmosphere. Dark brown, not black. Grant Erwin wrote: Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... I researched how to patina cast bronze black recently, didn't come up with anything. I wound up using a dark brown instead, looks OK. - GWE |
Blackening copper
In article ,
Mike Berger wrote: You can get that by heating the copper in a nitrous oxide atmosphere. Dark brown, not black. cringe Heating metal in a nitrous oxide atmosphere doesn't sound to me like the greatest way to stay healthy and sound of limb... That stuff has a tendency to go "kaboom" and/or encourage things to catch fire when exposed to high temps. Grant Erwin wrote: Roger Jensen wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... I researched how to patina cast bronze black recently, didn't come up with anything. I wound up using a dark brown instead, looks OK. - GWE -- Don Bruder - - If your "From:" address isn't on my whitelist, or the subject of the message doesn't contain the exact text "PopperAndShadow" somewhere, any message sent to this address will go in the garbage without my ever knowing it arrived. Sorry... http://www.sonic.net/~dakidd for more info |
Blackening copper
My mother liked them for art supplies.
Karl "Larry Jaques" wrote in message ... On Sun, 13 Nov 2005 17:18:17 -0600, with neither quill nor qualm, "The Davenport's" quickly quoth: "Karl Vorwerk" wrote in message ... Sulfuric acid will clean the oxide off the copper and it will be bright and probably frosty. If I remember correctly it's liver of sulfur your talking about and yes it stinks. Don't remember it's chemical name and don't remember if it turns copper black. Karl THAT'S IT!!! Thanks, Karl...I just KNEW that sulfur was in there somewhere! I guess it's been a LOT longer going back to 8th grade than I thought...I'll blame it on the drugs...yeah, that's the ticket...aspirin will do it every time. : I recently ordered 4oz of Liver of Sulphur from www.dickblick.com for $2.89. Minimum shipping is $7.98, so buy a few other goodies, too, to amortize costs. -- CAUTION: Driver brakes for Pukey Ducks (To ignite them.) |
Blackening copper
On Sat, 12 Nov 2005 22:41:48 GMT, "Roger Jensen"
wrote: I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog Go to a stained glass shop and ask them for black patina for copper. Follow the instructions... It is just that simple! |
Blackening copper
Roger Jensen wrote:
I need to turn a bit of copper foil black. I have less than 1 square foot to treat. Paint isn't an option. Anyone know of a good way to do this? Google search wasn't real productive. I am wondering if any of the Birchwood gun stuff would work?? I tried using a sulphur paste, it tarnished it, but not black... Thanks, rog I know this is an old thread, but maybe you haven't done it yet. You want liver of sulphur. Abrasha http://www.abrasha.com |
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