From The Semi-neutral Gray In Not Being Coloured By Any Primary

: ON THE NEUTRAL, GREY.

secondary, tertiary, or semi-neutral; hence any blue, purple, olive, or

gray added to it, at once destroys the neutrality of grey, and converts

it into gray. Thus easily defiled and changed in class, grey is rather a

theoretical than a practical colour. To our knowledge, there has never

been a true grey pigment, that is, one composed exclusively of pure



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