Why do crab shells turn red?

Online Answer
Once you put a crab or a prawn in a pot of boiling water or on a grill, heat destroys the crustacyanin protein. Then, the orange-ey astaxanthin is released, turning the shell of the crustaceans bright red.
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For people who really enjoy crab, 1.5 to 2 pounds of king crab per person should suffice. This number could be reduced to 1 pound per person if other dishes are being served, or guests have smaller appetites.
How to Reheat Cooked Crab in its Shell
  • Grab a large pot to boil water in.
  • Add about 2/3 water into the large pot.
  • Add a pinch of salt.
  • Once the water is boiling, add the crab legs. ...
  • Let the legs heat for about four to five minutes.
  • Using tongs, adjust the crab legs as needed to ensure full coverage in the water.
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