Orders placed after 4pm on weekdays will not ship until the next business day. Orders placed after 12pm Fridays will not ship until the following Monday.
Faster shipping methods may be available; just upgrade during checkout.
*Some exclusions apply.
Enter new zip code to refresh estimated delivery time.
This is 1 lb of Rochelle Salt from Photographers' Formulary. It is commonly used as a component when mixing brown, sepia, blue, and maroon Kallitype developers. It is also used for silvering mirrors and is an ingredient in Fehling's solution.
Table of Contents
Show moreShow less
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.
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.