On old time I've used ferric chloride for etching, I've manufactured a vertical tank for one board, using plexiglass. The board must be slightly moved up-down during the process. Vasile On Mon, Mar 9, 2015 at 5:52 PM, John Coppens wrote: > Hi all... > > I've been doing toner transfer PCBs for quite some time now. I switched t= o > clay-coated paper, which works very well, but the remnant of clay which > sticks to the toner seems to react with the etchant and generates bubbles= .. > > As I also accustomed to float the boards upside down on the surface, thes= e > bubbles interfere with the etching. > > Anyone experienced this? > > John > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .