Which pigment, present in Phaeophyta, is responsible for its brown colour?

The colour of Phaeophyta reflects the presence of the brown pigment fucoxanthin. It is a type of carotenoid found naturally in edible brown seaweed, which are used widely in Asian cuisine and also available as a nutritional supplement in capsule form. It is explored for weight loss, and to decrease insulin and blood glucose levels, etc. It may have anti-tumour effects also.