Milk test

First, pets died in the US in 2007, then infants in China in 2008 succumbed to the scurrilous practice of artificially boosting protein readings in milk products by adding the nitrogen-rich industrial chemical melamine to milk products. There was a global outcry when the practice was exposed; 300,000 children were affected of which 6 died. Now, researchers in China have published details of a simple and effective color-change test for melamine contamination in such products. Details appear in the journal Talanta. Their colorimetric test uses gold nanoparticles to determine whether or not a product is tainted.