New answers tagged chemistry
Put the fish under a blacklight and dab a bit of 4',6-diamidino-2-phenylindole stain on it. If it changes glow from blue to green, its been treated with polyphosphate. You can purchase DAPI stain here: http://www.sigmaaldrich.com/catalog/product/sigma/d9542?lang=en®ion=US I would suggest cutting a piece of the fish that you will not be eating, ...
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