Does any one know a simple test (like a litmus test) to determine whether a food stuff has been contaminated with plaster of paris?

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Bernardo Fernando

There are some food that may be naturally contaminated with calcium sulphate (gypsum) like cultured mushrooms (it is a commum matrix ingredient for its development). Also shell eggs, in very dry climates, may be impermeable with gypsum on its shell. To detect it easy a "Bromothymol blue" solution can be used. It turns to yellow in contact.

John K Fellman

Feigl, F., Caldas, A. 1967. Spot tests for calcium sulphate, lead sulphate, silver, thallium, and formaldehyde based on reactions with selenosulphate. Fresenius' Zeitschrift für analytische Chemie 231(4):261-265 http://dx.doi.org/10.1007/BF00708057

Marshall Jayasuriya

Many thanks to both Bernardo and John for the suggestions.