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Chinese Chalk is made from Diatomaceous Earth. It looks like a piece of chalk for ease in application. Just draw horizontal lines across cabinets, shelves, everywhere you see roaches. When roaches "cross the line" the diatomaceous earth cuts them like broken glass, they eventually dehydrate and die. You can find them down Chinatown, in hardware stores, just ask. They're cheap too, $1 each, and lasts until you use up the entire chalk. Really does work, in fact, I better go and buy some myself.