hypochromic effect
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https://doi.org/10.1351/goldbook.H02927
The opposite of hyperchromic effect (i.e. a decrease in intensity).
Source:
PAC, 1996,
68
, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2247 (https://doi.org/10.1351/pac199668122223)