Potassium Sodium L-Tartrate Tetrahydrate 99%

Potassium sodium tartrate tetrahydrate, also known as Rochelle salt, is a double salt of tartaric acid. Potassium sodium tartrate and monopotassium phosphate were the first materials discovered to exhibit piezoelectricity.^[3]This property led to its extensive use in "crystal" gramophone (phono) pick-ups, microphones and earpieces during the post-World War II consumer electronics boom of the mid-20th Century. Such transducers had an exceptionally high output with typical pick-up cartridge outputs as much as 2 volts or more. Rochelle salt is deliquescent so any transducers based on the material deteriorated if stored in damp conditions.

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