I was bored so I made a calculator in Microsoft Excel that worked out how much Sodium Chlorate and Potassium Chloride would be needed to make Potassium Chlorate. It takes into account any impurities of the two and works out how much of each you need to make your desired amount. If anybody wants it then just say so. I was also considering making one in PHP to put on the members site if it was any good.
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Stuart