Blue, by a long shot. A hundred years and 100 choices haven’t changed children’s idea of their preferred crayon shade. It’s blue, plain, middle-of-the-road, suitable-for-a stormy-sky blue.

Crayola recently unveiled their new packs of crayons that represent the world's skin tones. The pack, called Colors of the World, contains 24 different skin-tone colours.

Crayons, on the other hand, are something all four would be able to use together without any instruction. "What's great about coloring is that you can't be bad at it," she said.