Quote:
Originally Posted by lewdog
You have a suggestion for me?
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It looked like iron to me. You could do an ascorbic acid treatment. To test it out, get some vitamin c tablets and put them over the stain. It will likely lighten it slightly in that small spot. If it does, it's an iron stain. The AA treatment is pretty easy, but requires your attention for several days (have to lower chlorine and ph).