"Take of oil of lavender, 120 grains, of copal in powder, 17 grains, red sulphuret of mercury, 60grains. The oil of lavender being dissipated with a gentle heat, a colour will be left on the paper surrounded with the copal; a substance insoluble in water, spirits, acids, or alkaline solutions.
"This...
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Updated 113 Episodes
Forty Centuries of Ink
Episode 67
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