<p>Flame test on potassium. Potassium compounds give a distinctive lilac colour when placed in a flame. Potassium (symbol K) is a metallic element of group one of the periodic table. Flame tests are used to identify metal ions in a compound, as many metal ions show specific different colours. A platinum wire is used to hold the sample, as platinum does not itself colour a flame.</p>
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Science
Chemistry
Andrew Lambert
Photography
