Apparently the exact shades vary from person to person. There is an incomplete list of which emotions are usually associated to which hues; romantic love is indeed sometimes violet. And the exact shades are consistent between repeated viewings by the same enchanter, so an experienced enchanter can learn to distinguish emotions very well if they have the patience to study live examples.
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...not very specifically.
Apparently the exact shades vary from person to person. There is an incomplete list of which emotions are usually associated to which hues; romantic love is indeed sometimes violet. And the exact shades are consistent between repeated viewings by the same enchanter, so an experienced enchanter can learn to distinguish emotions very well if they have the patience to study live examples.