When the lobster is cooked, the digestive organs change color. "Tomalley, the digestive gland of a lobster, turns green when cooked,” says Brady. Some may refer to it as a lobster paste.

One of the differences between crayfish and lobster is their size ... At first glance there isn’t much difference between the color of lobsters and crayfish – crayfish are dark blue, green ...

These two species are very similar. The biggest difference is their color. We went to Ed's Lobster Bar in New York City to speak to someone who has a lot of experience buying, preparing ...

The key is a chemical called astaxanthin, which has the orange-red colour of a cooked lobster, and how it interacts with a complex of proteins called crustacyanin which lobsters produce. The reaction ...