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November 1997

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Subject:
Etchant for Au/Sn solder
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Date:
Wed, 26 Nov 1997 16:15:14 +0100
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[TN] (20 lines) 
Hello, Phil.
I use to try Kl/I2/H2O (4g/1g/40ml) plus Ammoniumpersulfate in the
proportions 1:1. Mix fresh every time.  And be careful with  no acids
into it. Keep locked and permit no others to play with it without
instructions. / If you want to etch the Tin part use HNO3 or FeCl3 in
different deionized water concentrations. Certainly, there are many
ohter ways. / Ingemar

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