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What are the yellow crystals that sometimes form in canned asparagus?


The yellow crystals that sometimes form in canned asparagus are deposits of rutin, a pigment which occurs naturally in asparagus. If the vegetable was packed in water with a high iron content, the precipitated rutin may be grey or black rather than yellow. Either way, it is harmless.
 

 

Barbara Willenberg, Nutritional Sciences, University of Missouri-Columbia

 

 

 

 

Last update: Tuesday, May 05, 2009

 

 


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