I've used J.E. Moser's aniline dyes for many years. WoodworkersWarhouse.com sells them. They have them in water, alcohol and oil soluble versions in MANY colors. You can mix it whatever strength you want. Mix it fairly strong and boo is no match.
Another great thing about aniline dyes is, you can mix and match the powders to get unlimited array of colors. On bows, I've used colors such as peacock blue/green, pink/red rose, dark liver-blood red, green, various browns, yellow, orange, black. You can also fade/blend from one color into the next on the same bow. Once ya get a couple handfuls of colors, you're only bound by your imagination.
Woodworkers Warehouse aniline dyes