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Galdieria extract blue comes from a unicellular red algae, which is an organism that thrives in extreme marine and terrestrial environments, according to the National Institutes of Health.

Biologists have found giant viruses in the deep sea and hiding in the genomes of red algae.

The culprits, red algae that form a crust on underwater surfaces such as coral, were previously known to grow only in small patches, tucked away in crevices among the reefs.

Most are microscopic, single-celled organisms like amoebas, algae, and diatoms, but larger multicellular protists exist -- such as kelp, slime moulds, and red algae.

The explorer attributed its color to red algae.