In life, the calcareous seaweed called Coral Weed (Corallina officinalis Linnaeus) is pink. You can see some pictures of this living pink alga in the previous post. It belongs to the group of red seaweeds or Rhodophyceae. However, when dead, the red pigments of Coral Weed disappear and its strange, white, chalky, articulated ‘skeleton’ remains. Similarly, the smooth, rock-coating calcareous alga known as Pink Paint (Lithamnion sp.) bleaches out from purplish pink when dead and exposed to the elements and turns white.
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