dark reaction (darkness reaction)

https://doi.org/10.1351/goldbook.D01518
A chemical reaction that does not require or depend on the presence of light. Contrasts with a photochemical reaction which is initiated by light absorption by one or more of the reactants.
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2183 (https://doi.org/10.1351/pac199062112167)