The seaweed turned purple - is it still safe to eat? Here's how to tell

Seaweed and egg drop soup is a soup that many people enjoy, and seaweed is rich in minerals; combined with the nutrients in eggs, it is highly nourishing for the body when eaten.So can you eat seaweed after it changes colour?

It is safe to eat when it turns purple. The seaweed sold on the market is all toasted and dried; after toasting, the cell membranes of the seaweed are broken. Seaweed grows in seawater, and once soaked in fresh water, the phycoerythrin and phycocyanin in the seaweed - two pigments unique to seaweed - dissolve out, producing a very purple colour. This is not caused by dyeing.