Payne's grey
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Payne's grey is a very dark blue-grey used in painting. It can be used as a mixer in place of black. Being less intense than black, it is easier to get the right shade when using it as a mixer. Payne's grey is a mixture of ultramarine and black or of Ultramarine and Sienna.
The colour is named after William Payne, who painted watercolours in the late 18th century.