As Martin explained on his Instagram account, the process starts with using a color extractor to remove any remaining artificial color. While preserving the gray roots, he then bleaches the rest of the hair to prep it for the new color.

Next, the crucial part. Martin bases the new color on the hair's natural gray pattern. The clients even have to come in with three to four inches of their roots grown out, so he can analyze the natural coloring of their hair. He then re-creates the pattern on the entire hairdo.

"Some clients have salt and pepper mostly in the front and the back is darker, so I match that and add some darkness to it," Martin told Allure. And just like that, about ten hours later, the women leave his salon enjoying the blend of their natural hue.

The LA-based colorist, who has worked with Sharon Osbourne, Jane Fonda, and other well-known clients, explained to Insider that the coronavirus lockdown has "absolutely" led to even more women around the world deciding to go gray naturally.

"Now, many women have about four to five inches of a new regrowth so they've started to see how beautiful their gray is naturally," he said. "Being quarantined at home for three to four months, seeing how much gray hair they have and how beautiful their gray hair is, many women have changed their minds and decided that they want to go this way."