@Kimbercakes I have tried the powder food coloring specially for red and it works great. You need to hydrate the poder before adding to the royal icing but it requires very little liquid to hydrate (a little spray from a spray bottle is enough). I switched from Wilton to Chefmaster and the red is really red, not pink. I use gel food coloring. The colors are more vibrant and I can control the consistency of the royal icing much better. If I need soft colors, I add little amounts with a toothpick. Letting it develop is also important. A couple of hours at least works best for me. Red, black and dark blue are probably all in the same category. They need time to develop and they will darken when they dry.