What color is it coming out? Also, are you using pre-made? If so, you might consider making it from scratch. You can color before adding all the sugar, allowing you keep the consistency right. Final adjustments of color can be made afterward. I’ve made very intense colors this way with good success. Also, adding black to the gumpaste will give you a purple-ish tone that may start your color off well.
Look for Nicholas Lodge’s recipe, it’s easy and works great.
