The Manufacturer and Builder 11, 1869
It is a fact well known to artists that the splendidly bright color of vermilion (cinnabar, or sulphide of mercury) has a tendency, especially if it has been mixed with white-lead, to become blackish brown and very dark-colored in a comparatively short time. This tendency of the vermilion is altogether obviated if, previous to being mixed with oil, it is thoroughly and intimately mingled with about one eighth of its weight of flowers of sulphur.
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