| Original Message: UV exposure will not result in the lavender (soft pale pink?) you are seeing. |
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As per Jamey's discussion, it is likely Mn (in trace amounts and perhaps in the form on potassium permanganate) that has created this color. This compound (if used) will readily oxidize (tie up / bind) the ferrous constituents to produce the clear color; and with a very slight excess (10 to 25 ppm) over that need to "tame" the iron, it will result in a soft purple; if no iron is present, then concentrations less than the foregong will create the deeper purples. With a concentrations over 30 ppm in the presence of iron, a deep purple often results. There are a lot of exceptions to all of this depending upon the other trace metallic constituents. Hexavalent chromium (CrO3) can also create ranges from orange to a mud brown; however, with the cancer-causing properties of CrO3, it is often avoided. Hope that this hasn't created any confusion.
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