Should ideally conditioned standards (kept humidity controlled, dark envelope, minimum exposure to light, minimum handeling) develop metamerism?
I’ve never heard of cases of metamerism developing over time, but there is no fundamental reason that it wouldn’t be possible. If two samples were colored with different colorants, it is feasible that the colorants in one could change over time differently from the colorants in the other. That could result in more significant metamerism. However, if both were made of the same colorants, then one changing should only result in a simple color mismatch (one changed, one didn’t) and not metamerism. How long samples last in a controlled environment is really impossible to say since it depends both on the material and the colorants. Again, I wouldn’t expect metamerism to develop where none existed before, but the magnitude might change over time.
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