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Re: Good sources for etching solution (nitol)?

In a message dated 17/06/98 05:42:02 BST, you write:

<< I read somewhere that "circuit-board acid", which can be purchased at 
 Radio-Shack-type stores, can be used to etch.  I have no experience
 with using it, so I certainly cannot vouch for its effectiveness or safety,
 I'm just mentioning it in the hopes that some other listoids can vote
 aye or nay.        Gregory >>

I use either standard ferric chloride or an ammonia based etchant at work
depending on the PCB's being etched, but I wouldn't recommend using it on iron
meteorites.
Ferric chloride stains virtually everything it contacts and gives a very
strong reaction in contact with aluminium for example. The ammonia etchant
needs enclosed, pressure fed jets to etch properly.
If I make up a large batch of nitric acid for etching irons, I find that it
doesn't keep for longer than a few days......then the solution starts gassing
and pumps the polyprop bottle up like a balloon.

For first timers, always take great care and advice when mixing & using the
Nitric etchant.......eye protection, face guard, gloves and some easy to reach
neutraliser are essential throughout.

Regards,
Rob.
http://members.aol.com/FERNLEA4/index.html