In this video series on Hair Styling tools, hairstylist Liz Muller shows you how to choose the best kind of hair foil for your hair. When color-treating hair, using the correct kind of foil is essential to get an even, consistent tone and a faster processing time. Watch this video for some tips. Liz Muller is the owner of Liz's Hair Design in Hollywood, Florida. As a professional hair designer and color specialist since 1985, she is one of the top Internet gurus on hair care, consulting clients from all over the world.