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    Why do Shellfish turn redish orange when you cook them?

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Here are some friends with simlar question as we.And I have this question for many days,anyone help us?
Kitty said: Yes.Why do Shellfish turn redish orange when you cook them?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(Why do Shellfish turn redish orange when you cook them?),it will help you,my kids.



Answer:
The pink or red color is the pigment astaxanthin, but its molecules are wrapped up in dark protein chains. So the shells are dark. Whenever you cook a protein, though, it uncoils, or denatures, and in the case of these shellfish, that frees the red pigment and the shell changes color.
The iodine content in them.
if you were dropped into boiling water what colour do you think you would go?
because of the iodine in their bodies


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