Always stir all colorants before using, and it's a good idea to scrape the bottom of the bottle to loosen packed pigment powder. Add a stainless nut to each bottle for agitating, mixing. Fluorescent colorants will usually be less-potent than other colorants AND Fluorescents hard-pack worse than most other colors, exception might be White colorant...White hard-packs bad.
Fluorescents will be weaker and hard-pack worse than others.