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ANALYSIS OF METAL FINISHING BATHS
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2.4
Optical Rotation **
Also known as saccharimetry, this method is based on the fact that when a solution contains optically active species, that is to say (normally) organic species capable of existing in mirror-image forms, but where such mirror image forms are not present, the plane of polarisation of the incident light will be rotated, in proportion to the concentration present. As its name implies, the method has its origins in determination of concentrations of certain sugars. However, as far as is known, optically-active compounds are not used in Metal Finishing formulations, although it would be interesting to know if they exhibited any special behaviour, were they to be used. For this reason, the technique is included only for the sake of completion.