Last, but certainly not least, blue. That’s right unicorns; you can finally have pretty blue for your confections! While blue is trickier than the other colors, it’s still easy to do.
You’ll start out the same way as you would the purple color, by washing and chopping a few red cabbage leaves, placing them in a pot with two cups of filtered water, and boiling them for 5 – 10 minutes. Then you’ll set it aside to cool completely.
Cooling the purple color is very important. If the purple color is even slightly warm, the blue color won’t process correctly. Once the purple color is completely cool, pour it into a mixing bowl. Add the tiniest amount of baking soda possible, and whisk until thoroughly dissolved.
The color change from purple to blue is almost immediate, so you’ll be able to tell what shade of blue it is pretty quick.
Be careful in the amount of baking soda you use. Only use just the amount you need to get the blue color you’re looking for because adding too much could mean that you’ll be tasting it later in the food you’ve dyed.
No one wants to have a sweet baking soda-flavored cookie, trust me. Gross.
To get the blue color above, I added 1/8 teaspoon (maybe less) of baking soda to my purple base. Next, I made a batch of test icing using the same recipe as all the others only using the homemade blue dye. I was satisfied that I couldn’t taste any baking soda, and neither could my taste tester. Just be cautious when mixing and you’ll be fine.
But look! Blue! So pretty!