Potassium Nitrate Melting Point Standard (1 g) (Potassium Nitrate),
https://www.manchesterbeacon.org/shop/rw2-1548350-potassium-nitrate-melting-point-standard-1-g-potassium-nitrate-306451
https://www.manchesterbeacon.org/web/image/product.template/306451/image_1920?unique=0e83fa8
This Potassium is guaranteed a Nitrate with the use of Melting g) and directly supplied to your lab by Gentaur's warehouse.
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