Study your clients cut and style and discuss the dimensional effects desired.
How to fold foils for highlights. Try not to crinkle up the foil too much or you could rub off some of the bleach or toner you just put on your hair. Do not apply mixture if skin is red or irritated or if Preview Strand Test shows any sign of breakage or damage. Use 4x5 pieces or larger depending on the length of the hair.
By using foils you can make precise highlights without having to worry about the hair colour reaching other sections of the hair. Fold the hair section into a foil to process it. Then really pat down before you fold the corners.
Want to know how I highlight my own hair at home. Once you have finished the lower sections move onto the top sections changing your rows to vertical. Pre-cut and pre-fold aluminum foil.
I want to add in case you d. Fold the foil over the tail comb away from you instead of towards you then paint on the colour and fold twice. If the hair is long you may wish to gently roll the foil from the bottom upward to the scalp instead of folding.
Continue until you finish each section. Theres no reason to fold the foil in on both sides and then up and up again. Instead place your color foil to foil or pleat the foil.
Stick the tail comb underneath the foil where the lip is and push forward to the where the top and bottom will meet then fold the sides in. Smooth the hair down on top of the foil and then fold the foil in half horizontally so it stays in place on your hair. Stagger your Highlights around your face keeping them small and subtle to frame your face.