Definitions

1. noun

A substance that is a mixture of two or more oxides of different metals that have been reduced so as to be free from color and capable of being used as a pigment.

“The artist used a variety of achromates to create a range of neutral shades in her painting.”

2. noun

A reduction of a metal oxide to an oxide of a lower valency, especially an oxide that is colorless and can be used as a pigment.

“The chemist studied the properties of different achromates in her research.”