Presence of peroxide in ethers of old stock can be tested by first treating them with $F e S O_{4}$ solution and then adding an aqueous solution of KCNS.
Ethers form peroxides, when come in contact with air and light.

$F e^{3 +} + K C N S \to$ Red colour

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Presence of peroxide in ethers of old stock can be tested by first treating them with F e S O 4 solution and then adding an aqueous solution of....& from red colour solution

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