"Pliny recorded processes involving metals, salts, , glass, mortar, soot, ash, and a large variety of s, earths, and stones. He describes the manufacture of charcoal; the enrichment of the soil with lime, ashes, and manure; the production of wines and ; varieties of s; plants of medicinal or chemical interest; and types of , gems and precious stones. He discusses some simple chemical reactions... and a crude indicator paper... of strips soaked in an extract of oak galls that changed color when dipped in solutions of blue vitriol... contaminated with ."
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Original Language: English
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Sources
Cathy Cobb, Harold Goldwhite, Creations of Fire: Chemistry's Lively History from Alchemy to the Atomic Age (1995) p. 55.
https://en.wikiquote.org/wiki/Earth_(historical_chemistry)
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Earth (historical chemistry)
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