In a message dated 96-12-08 20:46:52 EST, you write:

>I'd like to hold a narrow etch rate window with fewer bath changes.
>
>

Likely the only way to do this is with a color controlled feed and bleed
apparatus.   Tell us where your microetch is in the process, and if it is
spray or immersion, and there may be some other ideas.

Best regards,

Rudy Sedlak
RD Chemical Company

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