Yasmeen,

Are you trying to etch solder, or are you etching copper using the solder as
an etch resist?

If you are using solder as an etch resist, you can use ammoniacal etch.
Which can be purchased from a variety of suppliers.

If you are etching solder (or tin/lead plating) then you can either use a
peroxide or a ferric nitrate based tin stripper.  Both will work, and again,
can be purchased from a variety of suppliers.

If more help is needed feel free to ask.

Scott Griggs
Senior Applications Engineer
RBP Chemical Corp.
(612) 825-6113

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