Iron chlorides yes, plural!

> From: eis at alto1_altonet.com (Paul Nicholson)
> Date: Thu, 7 Mar 1996 13:57:13 -0800
> Subject: iron chloride
> iron chloride
> Ferrous-cloride, yes I bought five gallons of the stuff over 20 years ago
> for etching circuit boards and I've been hanging onto the remaining two
> gallons for years because I don't want to dump it down the drain (It's not
> used in the PC board business any more). If any body wants to trade some
> plants for FeCl drop a line.
> Paul
> Paul Nicholson              Electronic Imaging Systems, Inc.
> eis at altonet_com             5148 Commerce Avenue, Unit F

	_Ferric_ chloride was used to etch ptinted circuit boards,
because it does dissolve copper:

	2Fe+++    +    Cu    ->    2Fe++    +    Cu++

	It gets reduced to the ferrous form in the process.  Ferric
chloride is FeCl3, not FeCl.

Paul Sears     Ottawa, Canada