Rod:

Pretty much, the standard oxide is the standard oxide, is the standard oxide,
unless peel strength is the issue, which nobody seems to pay attention to any
more.

The main difference between various oxide chemistry is the pre-clean.

Once you have a perfectly clean surface, the only other salient difference is
the level of alkalinity, or conversely, buffering, which controls the oxide
weight, and this does not change, but very slowly, as the oxide picks up
carbon dioxide from the atmosphere, and converts the Caustic to carbonate.

The more buffering an oxide bath has, (and carbonate buffers), the lower the
oxide weight, and the less thorough can the pink ring reducer work.

And the normal pink ring reducer, DMAB, is a strange character, as it tends
to either work real well, or not at all.  I have seen panels where it worked
on one side and not on the other.  Go figure!

Typically you will want at least 0.5 mg/square inch of Copper to insure that
the DMAB does its job.

Rudy Sedlak
RD Chemical Company

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