Three major US grocery chains are to use labels or signs to indicate to shoppers that colour additives are fed to farm-raised salmon to give the flesh a pink colour.

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“We are going to be labelling packaged products with a ‘colour-added’ label,” Brian Dowling, a spokesman for California-based Safeway, was quoted by the Associated Press as saying.

“At fish counters, we are putting up a laminated sign indicating the same,” he added.

Meanwhile Karianne Cole, a spokeswoman for Albertsons in Idaho, said signs indicating “colour added” products would be displayed in stores’ fish cases.

Cincinnati-based Kroger said earlier this week it would label farm-raised salmon and trout as “colour added”.

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The three grocery chains are defendants in separate proposed class-action lawsuits filed last week by Seattle law firm Smith & Lowney. The lawsuits accuse the three companies of misleading consumers regarding the origin of the fish by not declaring the artificial colour in farm-raised salmon.

Wild salmon’s pink-coloured flesh comes from eating krill and other small crustaceans that contain astaxanthin or canthaxanthin, reported the Associated Press. Farmed salmon have naturally greyish-coloured flesh.

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