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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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#1
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tannin or tannic acid
I'm experimenting with turning woods black and have used steel wool
and vinegar but a friend said that tannin first then the steel wool and vinegar will ebonize just about anything. The problem,,, where can I get tannin or tannic acid. I've used tea leaves but I think there has to be something more...well, more Eric |
#3
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Eric
Before you get too carried away trying to by tanic acid you will find that oak sap is probablly the best source. In fact many woods produce it to some degree as a sort of natural preservative. The "Mix" I use for ebonising contains the "juice scraped from the underside of freshly stripped oak bark". I think I picked up the idea from an old book I found in the library on antique restoration many years ago. The basic recipie for which includes finest malt vinigar, swarf from the local engineers shop ( or wire wool ), oak sap, horse urine and for some reason an old penny coin. The latter being I suspect for the copper but I can't see why. A modern penny probably does not have enough copper to make a difference and personally I don't know any horses. Gregory Moreton RPT www.LearnToTurn.co.uk |
#4
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"Gregory Moreton" wrote in message news:1124269199.10efc1e59cf80fbf5c9a91871d03c561@t eranews... Before you get too carried away trying to by tanic acid you will find that oak sap is probablly the best source. In fact many woods produce it to some degree as a sort of natural preservative. The "Mix" I use for ebonising contains the "juice scraped from the underside of freshly stripped oak bark". I think I picked up the idea from an old book I found in the library on antique restoration many years ago. The basic recipie for which includes finest malt vinigar, swarf from the local engineers shop ( or wire wool ), oak sap, horse urine and for some reason an old penny coin. The latter being I suspect for the copper but I can't see why. A modern penny probably does not have enough copper to make a difference and personally I don't know any horses. Other tanbark trees, for instance elm, or in US, hemlock are also a source. The copper is used to speed the chemical reaction electrically, by sacrificing the more electronegative iron. Of course, a piece of copper piping or a fitting will do admirably. Perhaps a bit of urea-based nitrogen fertilizer will substitute for the horse. Visions of "A Funny Thing Happened on the Way to The Forum" keep cropping up in my head.... Oh yes, if you don't take the time to strip the oil off that steel, you'll have a longer wait. It does offer protection against corrosion. Solvent wash just fine. |
#5
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as a lab technician i ahev access to tannic acid and have used it with
great success and you are right you can ebonise any wood if you mix an Iron III salt (rust) with the tannic acid and just treat the wood as usual. of course you may have a bit of trouble getting it - check through your local chemist of chemical supplies to education - they might be able to help |
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