Metallic Silk Crayons by Tiger Tribe. These vibrant, sparkly, jewel-toned silk crayons are a new and improved twist on the traditional chunky crayon. They go on silky smooth like a pastel and then to change the look you simply add water with a paintbrush to create a water colour effect. When they are running out, just twist up to reveal more crayon. Encouraging children to colour, draw and doodle is an essential first step in developing their finger and hand strength as they grow. The rainbow of bright colours on offer is sure to be tempting for any budding artist.