Matching natural hair color to the Majirel color charts offered by L'Oreal to see similar shades is one way to choose the right shade of Majirel dye. Keep in mind that Majirel cannot be used to lighten hair more than three shades, but it does effectively darken hair.
For those who want to lighten hair more than three shades, bleaching the hair completely before applying the Majirel dye may be necessary. Additionally, dyeing hair red may require coloring it orange first depending on how dark the natural hair is. Using hot oil treatment on damaged hair is additionally recommended before dyeing any color.