White Knight is specifically made for highlights and works well even in darker skin tones. It'll give you the pop of white you're looking for.
Available in 1oz, 2oz, and 4oz from Bloody Wolf Tattoo Supply.
Eternal tattoo ink is a pre-dispersed ink manufactured in the USA. It is a non-toxic, glycerol free, water-based, vegan tattoo ink. You will find all the colors you could possibly imagine in the Eternal Ink Collection.