"Pigments found within his water colours include Gamboge, Quercitron Yellow, Vermilion, various iron oxides including Ochres, Umbers and Siennas, Indian Yellow, "Green Lake", Prussian Blue, Indigo, Cobalt Blue, Blue Verditer, Rose Madder, other red lake pigments possibly Carmine, Bone Black, and Mercuric Iodide (genuine scarlet). He used water colours in a block form and there is evidence he made some, if not all, himself. "

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