Delicious, color-changing Purple Sweet Potato Powder is an all natural food dye that can be used in savory soups, snacks or hearty smoothie bowls. Add to cereal, porridge, yogurt, smoothies or use in baking! Adjust your beverage to an alkaline pH value (8+) with baking soda for example and your raw sweet potato drink will magically change its color. Reverse the effect with acidic ingredient (lemon juice) and the color changes back to its original state.