Turmeric shall have the taste and aroma of turmeric and shall be free from musty odour.CHROMATE TEST FOR TURMERIC Ash about 2gm of the sample and dissolve the ash in dilute H2SO4.Then add 1ml of diphenyl carbazide solution.The presence of chromate is indicated by the production of violet colour.
Common adulterants in turmeric include rice flour, Wheat or jowar flour saw dust, rice, metanil yellow, yellow clay. Yellow clay can be detected by mixing turmeric with water. Yellow clay will settle down to the bottom after sometime leaving the turmeric on the top. Instant appearance of violet color after addition of few drops of Conc.HCl to the sample indicates the presence of metanil yellow. Lead chromate is also added which is highly poisonous. Dangerous chemicals and pesticides are used in growing the plants such as Copper Oxychloride; Dithane M-45; Bavistin are said to cause sperm damage in males.Know more on adulterants of all the food articles and their detection methods athttp://www.foodadulterationinfo.com/
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