Finder
Veteran
A quick and dirty explanation is that your prints colours appear to change depending upon the light source you are viewing them under. A print viewed under fluorescent light will look different when viewed under a different light source.
The Wiki link here
mgd711, thanks for your reply. I guess I have two thoughts if that is what the posters meant.
First, everything looks different as the illumination source changes. You can't blame a print for that. And that happens with any kind of print: inkjet, dye sub, silver, Polaroid, etc.
Second, that is not metamerism. You Wiki link correctly defines metamerism, but your understanding of it is different. Metamers always refer to a pair of objects. Metamerism has nothing to do with a single object. For example, you buy a red silk tie and a red velvet suit. In the store the colors matched perfectly. You go to the Queen's annual ball and because it is under candle light rather than the lighting used in the store, the red of the tie and suit do not match. Taking the objects individually says nothing as they are still both red and no judgement can be made to which would be the "correct" red.
However, perhaps the posters are thinking about something different. I just don't know what that is.