The squares of aluminum foil used to section off hair for highlighting is the same foil commonly used in kitchens. Pre cut squares may be available in beauty supply stores.
When applying highlights to hair at home, using standard foil is one way to save money. A roll of foil is available for very little money and then torn into strips that are 3 to 4 inches wide. The length of the foil strips will depend upon the length of the hair being highlighted, usually between 8 and 12 inches long. Preparing these strips before beginning the highlighting process is recommended.
For the sake of convenience, pre cut squares that are often used in professional kitchens or delis and butcher shops can also be purchased. These are typically packaged in pop-up boxes similar to those used for facial tissues. If aluminum foil is not available, wax paper is a suitable replacement.