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He asserted that the pattern books provided "a firm reference" for changes in wood-block-printed designs and the shift from "drab" colors at the turn of the century to "the full range of colours obtainable from the combination of madder, quercitron and indigo" employed for "straightforward floral designs" after 1807.
In America scarlet was created from the cochineal beetle, black from logwood and yellow from quercitron.
Also called tanbark oak, quercitron, yellowbark oak.