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Photographers' Formulary Rochelle Salt - 1 Lb

B&H # PHRSLB MFR # 10-1120 1LB
Photographers' Formulary Rochelle Salt - 1 Lb

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Synonyms Sodium potassium tartrate, tetrahydrate
Rochelle salt
Rochelle salt tetrahydrate
Seignette salt tetrahydrate
Potassium sodium L-tartrate tetrahydrate
Potassium Sodium Tartrate Tetrahydrate
Appearance Colorless to blue-white orthorhombic crystalline salt
Uses It is an ingredient of Fehling's solution . It is used in silvering mirrors.
Chemical Formula KNaC4H4O6.4H2O
Notes Also called Seignette salt after Pierre Seignette, an apothecary of La Rochelle, France, who was the first to make it (c.1675). Chemically, it is potassium sodium tartrate.
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