The material. Some coloring books offer the ability for the child to simply run over the surface with the pens or crayons provided, and it will turn out to be the right color regardless. Some are more like paint books, and some have magic marker surfaces and come with markers that will not show up on any surface but the specially prepared book pages. Choose the book that best suits you and your child. If you are worried about markings on the walls, then dont select a pack of basic crayons, get something that uses special crayons. If you want your child to exercise their own creativity and not have to fit in the lines or color schemes planned, get basic pages. It is up to you.
When you sit with your child and see him coloring on a book, you feel completely relaxed. Colors are all that you need to relieve your anxiety, depression and even stress. There is a sudden change in the mood of an individual, when he exposes himself to different shades of different colors. One look at red, purple and green shades and you are emotionally out of all the problems in your life.