Re: Photogravure

Walt Goettman (wgoettman@mm.wyeth.com)
Thu, 20 Nov 1997 15:59:34 +0000

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No one seems to know for sure. Many people think they may come from
residual whiting left on the plate after cleaning. I have also heard
it may come from free acid formed when water is added to the ferric
chloride.

Walt

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