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Review Summary
Sodium potassium tartrate, tetrahydrate
Rochelle salt
Rochelle salt tetrahydrate
Seignette salt tetrahydrate
Potassium sodium L-tartrate tetrahydrate
Potassium Sodium Tartrate Tetrahydrate
Colorless to blue-white orthorhombic crystalline salt
It is an ingredient of Fehling's solution . It is used in silvering mirrors
KNaC4H4O6.4H2O
10g (0.35oz)
The Photographers' Formulary Rochelle Salt is an ingredient of Fehling's solution . It is used in silvering mirrors.
Note
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.