Does anyone use sodium persulfate as etchant? I'm makeing my first pcb using toner transfer from kodak-paper. But the etchant doesn't work very well. I use about 0,8 dl etchant for 4 dl of water@ca 50° in a plastic bowl that and moved stirred it pretty much the first hour... The pcb is about 4x3 cm big. Now it has been in the etchant all night and only about 1/8 of the board has etched. Maybe the kodak-paper left something on the surface? I did iron it about 60 seconds on both sides. To long? /P.O.
Message
Slow etching, Sodium Persulfate?
2004-11-01 by P.O.