I normally add 2 TABLEspoons per 4 oz...and it turns out grey, so you have to add about 2x's (or more) of your normal amount of colorant.
So far...I have only been using HD in dark colors..like green pumpkin brown, black, dark browns etc.
I have not able to add it to clear baits...and get clear baits...but it makes some pretty nice "minnow grey" ones! (add some pearl powder)
Andy