Today I’m sharing a great recipe with you: Natural blue food coloring made with red cabbage and baking soda! You can use natural blue food coloring to color ice cream – yay! I made blue ice cream 😀 – frosting, drinks etc.
- 1 head of red cabbage
- about 1/4 tsp baking soda
Slice the red cabbage. Cover it with water, bring to a boil and simmer for about 15 minutes. Strain out the red cabbage (use the red cabbage for another recipe). Simmer the purple water for another 15 minutes till the consistency is syrupy.
Gradually add baking soda (not more than 1/4 tsp or it’ll taste salty and not very pleasant) to turn purple to blue.
Because homemade blue food coloring is dark blue, use some (soy) milk to test the color.
Now have fun with your homemade natural blue food coloring! I made blue frosting with powdered sugar, water and blue food coloring. If you add more blue food coloring, the frosting will be dark blue like the cookie on the right, if you add less blue food coloring it’ll be turquoise like the cookie on the left.
If you’re wondering if food colored with red cabbage food coloring doesn’t taste like red cabbage. 😉 No, neither the blue ice cream nor the cookies nor the soy milk tasted like red cabbage.
Natural blue food coloring is ph-sensitive: If you color an alkaline food, it’ll be blue. If you add it to an acidic food, the blue food coloring will change back to purple or even pink. But you can use the ph-sensitivity of DIY blue food coloring to make natural lavender colored ice cream or frosting: just add some drops of orange juice.
It’s best to use natural blue food coloring when it’s fresh; I don’t think it’ll keep very long in the fridge.
I used homemade natural blue food coloring to make blue ice cream, speckled blue robin egg truffles, rainbow ice cream cake, blue ice cream bombe, blue cake, baby blue frosting & icing, dark blue sugar hearts, blue ice bowls, blue pasta, blue-green pudding, dark blue sugar sprinkles and turquoise cake.
Here you’ll find my recipe for natural pink food coloring made with raw beetroot.