jamit
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Registered: 18-6-2010
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pottery grade KNO3
I recently purchased some potassium nitrate from a pottery supply store. 
It burned fine with 50/50 sugar combo. However, the color of potassium nitrate is off yellow, which to me indicates that it is not pure.
My question is: what kind of impurities might be in the pottery potassium nitrate?
I guess I could purify it by recrystallization, but I wonder if anyone's purchased any pottery KNO3 and tested for purity.
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Retard-3000
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I've bought KNO3 before that was slightly yellow, i've also had some that when dissolved in solution gave a slightly dirty yellow/brown colour. After
recrystallization though i had beautiful, perfectly white crystals
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Neil
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Fe?
It's so easy to purify, why not? 
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