I will have to play around a bit when I get the chance. I know that the pickling solution that we used on jewelry metals was very fast acting. Turned the metal black nearly instant. I have had fair luck in the past touching up scratches in case colors with just a quick application of cold blue. However, if you have an action with Patina and there are white scratches or marks, something more mild would be needed.
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B. Dudley
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