Lovibond tintometer method

Lovibond tintometer color can also be measured using objective automated instruments. In one version, the intensities of three light beams (red, yellow and white) transmitted by the oil are measured by photoelectric cells, and the results displayed as red and yellow color readings. The white light beam acts as a reference beam, and allows compensation for variation in the intensity of the light source (Rossell, 1986). AOCS Official Method Cc 13j 97 (Firestone, 1998) specifies how an automated tintometer should be used. However, this standard is valid only for refined oils. 

In the United States, the Wesson tintometer method predominates. This subjective method, which is described in AOCS Official Method Cc 13b 45 (Firestone, 1998), is experimentally much the same as the Lovibond method, but uses only red and yellow filters, and specifies the yellow number to be used with any selected red number the method is thus designed to measure the redness of the sample, and is more limited than the Lovibond method. 

Anonymous, Color Lovibond Method Using Color Glasses Calibrated in Accordance with the Lovibond Tintometer Color Scale, AOCS Official Method Ccl3e-92, American Oil Chemists Society, Champaign, Illinois, 1997. 

Lovibond [Tintometer]. TM for color measurement and water testing equipment used in standard methods specified by ASTM, AOCS, APHA, European and and U.S. Pharmacopoeia, ISO, BA, and IP. 

The Lovibond tintometer provides a well-known method of estimating the color of a solution in terms of standard glasses. Yellow, red, and blue glasses calibrated in Lovibond units are supplied. Various combinations of the glasses are observed to find... 

Although the original method was developed using a Lovibond tintometer for colour measurement, a more precise instrumental method could be employed. The colour absorbs at a maximum at 525 m/ and a 1-cm layer of a 0-008 per cent furfural solution under the given conditions has. an extinction of 0-70. 

The method determines the color of oils by comparison with Lovibond glasses of known color characteristics. The color of coconut oil is expressed as the sum total of the yellow and red slides used to match the color of the oil in a cell of the specified size in the Lovibond tintometer (I.S.I. 1984b). 

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