aliz~
"magic sets demonstrate several colors from colorless chemicals ... sodium ferocyanide and iron sulphate produce a deep blue. Phenolthaline produces a pink color with any alkali which returns to colorless when nuetralzed with an acid, and litmus paper and some dyes change color when made slightly acid or slightly alkali"
Source: http://answers.google.com/answers/threadview?id=390902
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