Hello, everyone

I am setting up a spray etching bath using merely CuCl2.2H2O and HCl.
My questions are

1. What are the concentrations for CuCl2.2H2O (???g/l or
???lb/gallon) and HCl (???ml/l or ???gallon/gallon)?

2. What's the reading of redox potential of a fresh bath at room
temperature or at working temperature?

3. How fast is the etching rate using this kind of bath?

Any input will be highly appreciated
suixin zhang
ELIS-TFCG/IMEC, University of Ghent
Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium
tel: 0032-9-2643371
fax: 0032-9-2643594
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