Susan, you're absolutely correct in that 3% H2O2 works just fine and is
easier - I just wasn't sure that they would have 3% in Israel, where it's
pretty likely that they do have the 35%.  I would disagree, however, about
the stabilizers...generally tin or some type of organic stabilizer is present.

>>> Robisan1 <[log in to unmask]> 03/19/98 08:26am >>>
We use 50% ammonium hydroxide and 50% 3% Hydrogen
Peroxide.  This lasts about 2 - 3 hours after mixing.

The amount of time needed to properly etch mounts will
vary from lab to lab.  It depends upon how much smearing
of copper is present and the person who etches.  Some
people press harder than others.  So you must experiment
to determine time to get good lines of demarcation and
grain structure (without over or  under etching)


The concentrated 30% poses a safety problem and had no
stabalizers in it.  The original formula that says use 10mls
water and 3 drops of 30% would yield about 10 mls of 3%.
We use medicinal grade Hydrogen peroxide - 30% and I buy it in
500 ml bottles.  I also buy my ammonium hydroxide in 500
ml bottles.  They both run out at the same time and keep
their individual strengths.

Susan Mansilla
Technical Director

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