Colorant testing classification system

A survey of acute oral toxicity, as measured by the 50% lethal dose (LD j) test, demonstrated that of4461 colorants tested, only 44 had an LD-,j< 250 mg kg and that 3669 exhibited practically no acute toxicity (LD > 5 g kg ). The rest fell somewhere between these two levels. The evaluation of these colorants by chemical classification revealed that the most toxic ones were found among the diazo (mostly benzidine derivatives) and the cationic dyes. It is widely known that some general cationic compounds have toxic properties. Pigments and vat dyes by comparison were discovered to have extremely low acute toxicity - presumably due to their insolubility/very low solubility in water and in lipophilic systems. 

Test has been conducted for the five varieties of mango fruit only, but can be extended for other fruits where there are reasonable changes in skin color texture occur with maturity. The variations of classification performances with the variation of other factors like changes in ambient light, camera resolution, and distance of the camera were not studied. The study shows that, machine vision based system performance, is closer to the manual experts, where experts judge the mangoes maturity level not only by the skin color but also with firmness and smell. 

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