Fats and oils testing (emulsion test):

Add ethanol to a very small amount of the substance to be tested. Shake or crush to dissolve. In tough cases it can be warmed gently in a water bath.
Filter or dilute if necessary to obtain a fairly clear liquid, which is the solution of fat in ethanol.
Pour this solution into a test tube containing tap-water. A white (milk-like) emulsion indicates the presence of fats or oils.

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