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I go around my drawings after finishing using colored chalk to match the colors in my drawing. To keep this beautiful effect from coming off spray it with hair spray. I usually do two light coats. You won't believe how the color of the chalk gets brighter and has a satin sheen. The chalk will not come off. Use the cheapest hairspray. Actually works better.
If you have made a chalk or charcoal drawing, use a light coat of hairspray to set your drawing and help prevent smudging. This is a page about hairspray for setting chalk on paper.