Simple techniques for detection of formalin in milk

The detection of formalin in milk was accomplished by different techniques. Hehner's test with modification and spot tests using porcelain slab, thin layer silica-gel and filter paper were tried as simple techniques for detection of formalin in milk. The results obtained from this experimental work revealed that the optimum concentration of sulphuric acid containing ferric chloride needed for the detection of formalin was 70% V/V. From these techniques, spot test, using porcelain slab was suggested to be the most economic, simple, rapid, sensitive, safe and applicable routine rejection test for incoming milk in dairy plants or at home without any complications