For the color run perhaps? Use pastels instead of chalk. Dampen a section of clean hair, Coat section with pastel, Seal the color temporarily by drying with a hair dryer or using a flat iron, Set the color with hair spray, Style as usual.
If you would like to add some color to the ends of your hair but aren't sure if you want to risk the hair dye. Then you should try chalking your hair! It's so much safer than color or dip dying, you only need one thing to do it!