Carolina Mendez Hernandez - from San Jose, Costa Rica
I do not recommend using chalk in cake decorating because it is not a food safe material. I love using Pearl Dust and Color Dust to brush and paint my flowers. These are edible, food safe powders that come in a rainbow of colors. Pearl Dust has a lusterous finish and Color Dust is matte. Both are available in major craft retailers in the baking aisles, and also online here:
Pearl Dust - http://www.wilton.com/store/site/product.cfm?id=1B002240-423B-522D-F6C386AABC28C24A&killnav=1
Color Dust - http://www.wilton.com/store/site/product.cfm?id=B742E020-1E0B-C910-EADA7B50B94B99F5&killnav=1