Oh, and a knife too.
"I have a painting in my apartment that a friend did for me a while ago that has a lot of colors on it, and I fell asleep one night and dreamt of all these layers of paint living together on one surface," she told Marie Claire. "When I woke up, I thought about how beautiful that would be on the hair and how I would translate that vision onto the hair."
"You place the section of hair flat onto the glass, which transfers the design from the plexiglass onto the underside of your hair," she tells Marie Claire. "Then, you use a 6-inch-long putty knife and then press the hair into the pattern to saturate the top side of the hair as the color seeps through your strands."