Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: Etchant Identification
From: Edward Brown <brownedward478@...>
Date: 2012-09-24
Looks like ammonia per-sulphate,that turns light blue when mixed with water,and its more environmentally safe.
Don,t mix it all if you buy it only mix enough for the job
Sent from my iPad