Originally Posted by Photo Engineer
You have likely ruined the developer. The only way to tell is a test of the process.
Even after bringing it back to the proper concentration? Note that it was wash-water (the first flush after developer) that went in there, not acidic stop bath.
I hope that's not the case because that's what I've just done. And I don't see how it'd be possible either.
Analogue Photography and Film FAQ
Open-Source F/Stop Timer