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Perry's motto when it comes to dyeing hair platinum blond is to "go low and slow, which means a lower developer and then a longer processing time." By nature, the platinum can be damaging on hair, but this helps make the process a little easier to tolerate.
"When taking the steps to get the ultimate platinum blond, you must assess what you are working with — whether it's hair that's been processed before or hair that is virgin," Castellanos says. Her tip is to do a patch test on a couple of pieces of hair to ensure the desired color is possible and there's no leftover gloss or dye on the hair that could interfere.
Dyeing Color-Treated Hair Platinum: If you're starting with color-treated hair, Castellanos says you'll likely have your head foiled, which can take anywhere from three to five hours. "I start with the mids and ends and leave an inch of roots for root application, which I do afterward," she says. "Since the roots are the one guaranteed part of the hair that will turn platinum, it needs extra care and to be taken care of separately."
Dyeing Virgin Hair Platinum: To take virgin (natural, undyed) hair platinum, your natural base color will impact the method used. "[It] can be done by applying free-handed bleach to the mids and ends of the hair," Castellanos says. "I process these parts of the hair first because they don't receive body heat like the top of the head. Then, bleach the roots once the mids and ends have lifted to a brighter color."
Whether you're working with virgin or colored hair, the processing time will vary from person to person. "Each part of the hair needs a different amount of time to process," she says. "You cannot apply bleach to the entire head and expect an entire head of hair to look the same."
This is why it's an absolute must to see a professional if you want to dye your hair platinum. Repeat after us: don't try this at home.