Q&A: How can I stabilize the colour of products with watermelon extract?

In the June Q&A, Anna asked, I formulate 99-100% natural products, and love color, so I’ve been using natural colorants in my products, such as glycerites, watermelon powder (Citrullus Lanatus (Watermelon) Fruit Extract from Formulator Sample shop). My general formula is: hydrosols, distilled water, allantoin, sodium lactate, glycerite (or watermelon powder), natural chelating agent-PA3 (Sodium…