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We present a magneto-optical method using Brown's relaxation in ferrofluids. This method permits one to make some viscosimetric measurements by putting a drop of miscible ferrofluid into a test liquid, glycerol or diethylene glycol (DEG). To test this method we have compared our results obtained for glycerol with those obtained from a more conventional method and we observed good agreement. After this validation, we were able to study the viscosity of DEG between −20 and +90 • C by using our magneto-optical method. The comparison of these results with those obtained in standard ways (in the temperature range from −10 to +20 • C) revealed very slight deviations.

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