Potassiumsalt(1) WhentheFlameColorationTest(1) < 1.04 > isappliedtopotassiumsalts, apalepurplecolordevelops. Whenitgivesayellowcolor, ared purplecolorcanbeseenthroughcobaltglass.(2) Neutralsolutionsofpotassiumsaltsyieldawhite,crystallineprecipitatewithsodiumhydrogentartrateTS.Theformationoftheprecipitateisacceleratedbyrubbingtheinsidewallofthetesttubewithaglassrod. Thesepa-ratedprecipitatedissolves uponadditionofanyofammoniaTS, sodiumhydroxideTSorsodiumcarbonateTS.
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