"Dave Hinz" wrote in message
...
On Thu, 27 Apr 2006 11:06:05 -0400, Andre Langevin
wrote:
I have found this:

5% Cupper sulfate CuSO4 is a good solution for that, where it forms
black
color with zinc and red with steel.

So i will test with some on a cotton swab and check which color it
turns,
black is zinc.

You're aware, I hope, that gas tanks that are "empty" can have enough
residue in them to stay explosive, sometimes for years, right? I went
to an emergency call a few years back where a fellow was cutting an
old
gasoline tank, had been empty for as long as anyone could remember.
Took him a couple days to die of his injuries. This isn't the time
for
random experimentation. Take it to someone who knows how to handle
it.



We had one like that about a year ago, The guy had bought an OLD service
station and decided to cut up the in ground tanks and pull them in
sections. He ended up in two sections himself.

--
Steve W.
Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your ass tomorrow!



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