[sdiy] Audio circuits and basic electronics knowledge recommendation.

[Olav Martin Kvern]

Hi David [Dixon],

re: alternatives to Ferric Chloride

I've been using Ammonium Persulphate for years, based on a photo-process writeup that Ray Wilson used to have on his site. This works amazingly well, and I much prefer it to Ferric Chloride. Any comment on the chemistry of this approach?

Thanks,

Ole