This is good news to hear, Rudy. We are small workshop building PCBs for
prototyping and discovered the alkaline ammonium sulfate some years ago.
The reason for choosing of this etchant was the fact it can be
electrolytically regenerated. However it seems like one of the
slowest etchants around. The boards are all bright tin finish and since
alkaline sulfate is best known etchants for tin resists it'll be best to
stay with what I've got.

     Alkaline ammonium sulfate etching is virtually unheard of in Australian
pcb shops. I think we're the only mob in this country to be using it. Do you
know how common this etchant is used around the world ?

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