The New York Times:

In 2013, the Food and Drug Administration approved Mars’s petition to use the microscopic algae spirulina to make the first natural blue dye approved for use in the United States. As a result, any food manufacturer in the country can legally use spirulina as a colorant. Mars spent years researching spirulina’s safety; in order to overhaul 1,700 or so recipes and update its global manufacturing capabilities, the company desperately needs a substitute for synthetic Blue No. 1, as does the rest of the industry. But right now, there isn’t nearly enough spirulina dye to go around — and in any case, sometimes it doesn’t yield just the right blue, or the color degrades and comes out blotchy, or it tastes odd. So researchers are still looking everywhere for other natural blue pigments.

Really interesting article about the industry’s search for natural alternatives for the colors found in many of our favorite foods.