Dave,

To answer your 1st question. I would not touch a torch job. Simply no way to tell if or how much damage was done.

About your second question. I have been playing with this method. I have learned that you can not apply several "chemicals" at once. They have to be applied in stages. The most difficult color to achieve is the bright blue that true case color can have. At least the cold blues I have tried so far are unable to achieve to that bright blue.

Pete