A technical dictionary of printmaking, André Béguin.
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copper sulphate
Blue crystals or blue crystalline granules or powder. Soluble in water and slowly soluble in glycerin. Formula: SO4Cu.5H2O.
Used in:
- "Bordeaux-etching" (invented by Cedric Green)
- "Electro-etch" (developed by Omri Behr)
- Zincography
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