Before: Leah prelightened the model with Formula A and glazed with Formula B.
1. Start with a diagonal, fine section at the front top of the head. Leave the very front piece out because it’s directly at her face—this keeps your blonde looking blonde when she sees herself in the mirror. Place the section on a foil.
Pro Tip: Work in very fine sections for max saturation. “You should be able to read a text message through it,” Leah said.
2. Apply Formula C around the face. Leah cuts her brush in a V-shape to create a spike of color at the base and lighter saturation through the midlengths.
3. Apply Formula D next to Formula C using another V-shaped brush. On a foil, top with balayage film.
4. Take another slice and repeat the technique. Mix up the placement of each shade on each section, remembering to keep the lighter shade closest to the face. On some sections, Leah placed Formula D overlapping with Formula C; on others, she put Formula D between Formula C, and on others, she went side-by-side. Work until you reach the high point of the head, but leave a veil of blonde to lay over the colored sections, keeping the look diffused. Process, blow-dry and style.