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Potassium Nitrate - KNO3 Powder - Laboratory Grade - 1 Pound | 1 Lb

Potassium Nitrate - KNO3 Powder - Laboratory Grade - 1 Pound | 1 Lb
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Careless-Resource-72 posted on r/rocketry56w

You mean like this? https://www.amazon.com/Generic-Potassium-Nitrate-Powder-Laboratory/dp/B0CTC6TNHP?gQT=1 Not free however.