The dye gives your character piebald. Piebald is where lack of pigment forms on a characters skin in the form of patches, these patches appear as white splotches. Piebald is a quite expressive trait and is hard to miss on a character so make sure to add enough visible splotches.

Visual example of what piebald looks like on a character without and with it. Piebald is more present on certain characters while its less visible on others, just make sure we can at least identify the trait if used on a character.