As mentioned above, Hering’s opponent process theory clashed with the trichromatic theory that dominated his time. In fact, Hering was known to strongly oppose von Helmholtz’s theory.

Ebbinghaus, in the last number of the Zeitschrift für Psychologie announces as new a discovery which has a critical bearing upon Hering's theory of colour-vision—the fact, namely, that two ...

THE following translation of the critical account given by von Helmholtz of the colour-theory of E. Hering, in the new edition of his Handbuch der Physiologischen Ohtik, commencing at page 376 ...