On 2/22/2013 10:10 PM, Dr. Stephen A Bloom wrote: > At 09:02 PM 2/22/2013, James wrote: >> ferric chloride, ebay > > or micromart > ---http://www.micromark.com/ferric-chloride-etchant-16-oz,8350.html > $6.76/pt Or just make your own. Get a gallon of HCl, dump in a pile of iron filings and before long you will have FeCl.