You can try spreading the dye with using rubbing alcholol, but if that doesn't work, you may have to buy black dye like Rit. You can try using a black sharpie, but I doubt it would look the same like how it was.
well since I love acting this is a good question for me ok so I would make a movie called my best friend and I cause mostly people fell in love with there best friends the story will be about a girl felling in love with her bestfriend and she does know the he like her back and yah like that and I would cast my bestie lucky and her bf cause like they use to be best friends and now there dating I would film it at the beach where they meet I would give myself a support role thank u.