An aminophenol-type developer which gives results similar to metol-hydroquinone but which can he used by some who are subject to metol poisoning.

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* Gradol is the hemisulfate of para-aminophenol and has a molecular weight of 158.14. You can substitute para-aminophenol hydrochloride for the Gradol, use 90% of the amount called for. No need to make any other adjustments. — Gerald Koch

For tray use, dilute 1:1:2 and develop for 4–8 minutes at 18.5°C.