If you're as confused about how foilayage differs from traditional highlights and balayage as I was throughout this process, let him explain. "Foilayage combines the use of balayage (freehand painting of lightener) and separating the lightened pieces with foil for even lifting, control, heat, and protection against bleed marks (blotching from pieces touching)."
He then freehand painted a few more sections of hair before letting the lightener work its magic. Finally, he applied the toner, which would give me the golden caramel colour I was after.
Image Source: POPSUGAR Photography / Alyssa Kaplan