Franklin:

Sean Clinton's comments are right on the money, let me add a couple of things.

In developing, pH and rinsing are the key elements, after your nozzles are
clean.  Monitor your tests and your developer by pH, (if you are not
controlling by pH).

Also note, that in many installations the really difficult to clean, and
dirtiest chamber is the first rinse, so make sure you are cleaning that out
thoroughly, preferably using a good equipment cleaner, no generic chemistry
works nearly as well as a good equipment cleaner, and this is even truer in
hard water areas.

If you were going to do a DOE, I would use pH as a variable that you checked.

Rudy Sedlak
RD Chemical Company

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