NPG 349 (3b)
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Undated note written by Benjamin West giving instructions on how to achieve a storm effect in a landscape painting.
A mountain side in shadow receives more reflected light, from another across a valley, than if a plain had run off from it and the objects are more definitely made out . A midday sky, where no particular effect is aimed at, blue alone does it, gradated very thin on the white paper, as you come nearer the bottom, which from the opposition of the sky, and the landscape when finished will appear yellowish.
(illegible) you may mix with your ethereal blue a little Indian ink.