What is isochromism?

Answer 1

Isochromes are patterns of interference colors on which dark bands called isogyres are superimposed. Isochromes are the colored part of the interference figure.

Answer 2

Isochromism is the phenomenon where two different chemical compounds have the same color or absorbance in a given solvent. Despite having different chemical structures, they appear indistinguishable in terms of color or absorbance when observed in a specific solvent. This can be due to similar electronic transitions or chromophores in the molecules.