Rick-it turned black like this? Was it immediate? I'm not going to say there is no way I dumped stop into the fix... But my stop is full and I would never have dumped fix down the drain. I reuse both stop and fix in gallon jugs and they are both full. Stop is indicator stop and it's still yellow - and 30 rolls in too. So I would think it would be pink if I dumped dev in the stop. It did not turn black immediately either.

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