# Catalogue Entry: NATP00018

## An Extract of Mr Isaac Newton's Letter … concerning the Number of Colors

Source: ‘An Extract of Mr Isaac Newton's Letter … concerning the Number of Colors, and the Necessity of mixing them all for the production of White’, Philosophical Transactions of the Royal Society, No. 97 (6 October 1673), pp. 6108-6111.

[1] * See Numb. 80. p. 3079.