It seems that there are many factors that affect the color of tritium lume, including, light, moisture (mold), and other factors. But it's so slow and variable, that I don't know if any person really knows for sure. Most likely it will continue to gradually change over time. I have also heard that sometimes the color changes more in the dark and becomes lighter in the sun. But I am just repeating what someone else told me, and I have no way to verify that. I definitely believe that the way the color changes is related to the formulation of the lume compound itself, since lume from different years often tends to age differently.
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