I recently needed blue gel paste to color some fondant I was using for elephant cupcake decorations, but I was lazy and cheap, so I thought, hmmm…can powdered coloring work??? And what would I thicken it with? Yes and cornstarch…
There aren’t any precise measurements to this, I just took the some powdered blue food coloring (I used LorAnn Food Coloring Powder) and dissolved it in water in my little prep bowl, added some cornstarch, stirred until everything was blended, and popped it in the microwave for a few seconds until it was thick and gel-like in consistency. As you can see from the picture above, it worked out quite well!
And here are my fondant elephant cupcake toppers:
Just like with gel food coloring, a little goes a long way with powdered, so I started with 1/16 tsp and about the same amount of cornstarch. I just used enough water to dissolve everything together. You can play around with the proportions of powdered coloring/cornstarch/water to suit the needs of your project. You can probably also substitute liquid food coloring for the powdered and follow the instructions as is. I haven’t tried it, but I don’t see why it wouldn’t work!
Helpful tip: when coloring fondant with gel food coloring, always use powder-free gloves. They keep your hands clean and the fondant from sticking to your fingers!