When you suggest that the ammonium sulfate etchant is the "best" for Tin, you
have to watch your definition of "best", as most people would much prefer to
put on more Tin, and be able to etch faster.

Because most people are in a situation where they can return spent etchant,
and they want the speed, the sulfate based etchant is virtually unheard of in
the world.

I am not familiar with anyone using this etchant anymore, but I also am not
aware of what most of the east coast of the US is doing.

Rudy Sedlak

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