Possible tests of tricritical behavior in classical multicomponent mixtures

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Abstract
It is argued that an optical measurement of the interfacial tension tricritical exponent μ=2 would involve a strongly divergent signal in classical multicomponent mixtures, as opposed to the 3He–4He mixture. Similarly a very intense bulk critical opalescence is expected in the former case, corresponding to the response function exponent γτ=2. The principle of an NMR mapping of the ’’α–γ’’ interfacial profile predicted by Widom, is proposed. Finally, a few conjectures are made regarding possible tests of tricritical dynamics in classical mixtures and in metamagnets.