[pure-silver] speed loss with perceptol

Hi, I'm out in west texas shooting FP4+ in very bright light. I'm thinking of trying Perceptol when I get back to my darkroom, but I read on the ilford site that there is some speed loss with perceptol. It didn't say how much. So, how should I adjust exposure? Today I shot it at ISO 100 instead of 125. 

I'm shooting roll film, not sheet film.

--shannon

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