Pigment Black 654 Subject

Bacterial pigments. Some bacteria commonly found in caries lesions are known to produce pigments. For example, the black staining of plaque is related with Actinomyces (Slots, 1974), but its chemical nature remains unknown. Black pigmented Prevotella produces both iron sulphide and heme pigments (Shah et ah, 1979). In addition, Propionibacterium forms porphyrins (Lee et al., 1978). Bacterial iron-binding peptides, which can contribute to discoloration, increase in the saliva of subjects with a high caries frequency (Nordh, 1969). 

CS analyses on 1-cm segments Study of hair levels albino vs. pigmented rats (animal test), and black vs. white hair (human test) CS analysis on 1-cm segments CS analysis on 1-cm segments Subjects given (A) a single dose of 600 mg, or (B) 900 mg/d for... 

When we consider a short survey of today s major Inorganic Pigments, we are faced vith the realization that the three major pigment families titanium dioxide, carbon black and iron oxides, accounting for more than 90 % of the vorld vide tonnage, as sho vn in Table 1-1, are all outside of our subject matter. They are vell kno vn to everyone, and have already been discussed in depth in recent handbooks ... 

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