Nowadays the World Wide Web made simple getting information. And color by number books reap benefits of the web progress.
Learning the color of a chair, or an elephant, of flowers, sun, zebra, parrot etc, will not need mugging up, but mere practical activity that will leave an everlasting impression on these little developing minds. You can also engage them in activities like creating new colors by mixing 2 or 3 colors. This will make them understand the evolution of different colors, which is fun too..
Studies have shows that anxiety levels dropped in adults that colored. They did note that simple doodling had no affect on anxiety. The focus on coloring and switching off the brain allows that blocking of anxiety in the moment. Coloring does not have a need for complicated thought processes and like listening to calming music, you are able to get within yourself, isolated from external anxiety, commotion, and distractions.