Quote Originally Posted by Aggie
Sandy if the pyro based developers harden, then why when he developed in pyrocat the negatives scratched and when he used the TFX-2 they didn"t?

It was not clear to me when the scratching took place, whether with pyrocat or with TFX-2. But regardless, even though pyrocatechin and pyrogallol harden negative emulsions they don't make them scratch proof when still wet.