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9I now return to the preparation of vermilion. When the clods are dry, they are pounded and reduced to powder with iron beaters, and then, by means of repeated washings and dryings, the colour is produced. When this is effected, the vermilion, deprived of the quicksilver, loses its natural tenacity, and becomes soft and disconnected; and used in the last coat of the plastering of rooms, keeps its colour without fading.
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