PURPOSE: To obtain the titled dye which has excellent light resistance and color- developability and does not emit malodor, by neutralizing a solvent extract of krill, adding lipase or an alkali thereto to decompose fatty acids and impurities and extracting the treated soln. with a fluid in a super critical state.

CONSTITUTION: Krill are extracted with an org. solvent such as acetone or n- hexane. 0.1W1pt.wt. water is added to 1pt.wt. crude dye soln. obtd. by neutralizing the pH of the extract. 50W200 unit of lipase is added thereto and the mixture is heated at 35W40°C for 10W40hr. Alternatively, 0.1W5pts.wt. alkali and 5pts.wt. ethyl alcohol are added to the mixture of water and the extract, the resulting mixture is refluxed for 1W5hr and the pH thereof is then adjusted to 3 or below, whereby fatty acids and impurities are decomposed. The treated soln. is fed to an extraction tower 4 and a fluid (e.g. CO2) brought into a super critical state by a compressor 2 and a heat exchanger 3 is introduced into the tower 4 where said treated soln. is extracted with said fluid at 30W90°C under a pressure of 70W500kg/cm2. The pressure of the fluid is reduced by passing it through a reducing valve 5, fatty acids, etc. are separated in a separator 6 and the fluid is passed through a condenser 7 and recycled to the compressor 2.