This Review Title is Great non-permanent hair color! and the content is: My son wanted to dye his hair blue - ummmm no.  Hair chalk was the perfect compromise.  It adds as much or as little color as you want.  It lasts one day - I would recommend washing it out each night or you will wake up with it all over your pillow.<br /><br />Super easy to apply - you can add in different shades of the same color to add dimension, do all the same color, or add as many colors are you like.  I love that this gives my kids the freedom to make their hair original but isn't permanent and doesn't have smell like the hair spray colors do..There are other information for this review, one is This reviewer did purchase it and the other is 0 people think this review is helpful.