The Young-Helmholtz trichromatic theory was not supported by a phenomenon which occurs if a stimulus is viewed steadily and is then withdrawn. This phenomenon is known as:

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The Young-Helmholtz trichromatic theory, which suggests that the eye has three types of receptors for color, does not account for afterimages. Afterimages occur when staring at a stimulus for a prolonged period and then looking away, resulting in seeing complementary colors, which is better explained by the opponent-process theory.

The Young-Helmholtz Trichromatic Theory Was Not Supported by a Phenomenon