https://www.youtube.com/watch?v=HC_1DfBchj4

The bold colors of the chalk markers for blackboards are ideal for other non-porous surfaces such as blackboards, windows, whiteboards, plastics, bistro boards and mirrors. They produce a neon look when used and create bright colors for any writing project. The Gold Star Selections Chalk Markers are sold exclusively for online shoppers on Amazon, here -- http://amzn.to/1ihCZps