well, i can give an opinion, not only from miniature painting, but from years of commercial painting as well. solvent based paints and clears, especially lacquers, yellow over time. now, some paints, even though they are fully cured, "gas out" over time. this gassing out is what tends to make paints brittle and flake off over long periods of time, and it also can change the tint in a color. of course, the color that a change would be most recognized would be white.
now, personally, lacquers and enamels have been the worst culprits that i have come across. however, i have seen some acrylics do some strange things, but it usually takes bizarre conditions.
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