Black goji berries have been identified as a potential natural colourant source that is able to produce red, purple, and blue colours depending on the pH levels.
Read more about it via https://www.foodnavigator-asia.com/Article/2019/04/17/Bet-on-black-goji-Berries-a-potential-natural-colourant-for-red-blue-and-purple-study?utm_source=RSS_Feed&utm_medium=RSS&utm_campaign=RSS
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