Colom intensity

By using layers of FCjOj brilliant, intense coloms can be obtained from layers only 50-250 mn in thickness. The FCjOj-mica pigments form absorption and interference coloms simultaneously, the observed coloms again being dependent on the layer thickness. 

For amounts of potassium nitrate higher than o-i% the reaction is sharp and intense. A feeble coloration with brucine or a slightly colomed ring with ferrous sulphate should be neglected, since extracts may derive traces of mtnc anhydride from the water used m their preparation, such quantities, however, never amount to o-i% of the extract... 

MACDOUGALL, D.B. and POWELL, v.H. (1997) Relative imporlanee of temperature, wavelength and intensity of light on the colom display of fresh and aged beef cuts. Proceedings of the 43rd International Conference of Meat Science and Technology, New Zealand, 668-669. 

Red beet gives a nice strawberry colour in ice cream, dairy products, fruit preps, jams and jellies as well as sugar confectionery products, which are not subjected to heavy heat treatment. It is a very intense colom and dosage levels are usually low. However, the pigment is susceptible to heat degradation and oxidation, which limits its use but can, in part, be overcome by adding the colom after heat treatment. Stability is highest at pH 4.5, and red beet colour is not recommended for alkaline applications. 

Light coloms create the impression of spaciousness whereas dark colours tend to be oppressive. In some areas of labom intensive work, the operators may have strong preferences for the colom of the general decoration. Meeting their wishes can have a beneficial effect on productivity. Table 3.8.1 shows the illusory effect of certain coloms. 

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