Sounds as if it worked. The cold temperature cause it to fall out of solution, I think 658F is too cold, I use minimum 80* (fish tank heater temp) and start with hot tap water. I try to watch the process closely to pull the object before the white residue coat happens.
I'm not sure what the black patina is. I haven't had any issues but I always sand bare metal with 400 grit 3M paper so that may be why I haven't noticed it. Fatal dose of wood bleach is ~60gms for a 220lbs person, about the same as Clorox, slightly worse than salt, be careful not to eat or drink it!
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