Soy crayons have been created to replace toxic petroleum-wax crayons, soy crayons are safer to use, brighter in color, and less expensive to produce. One acre (43,560 square feet) of soybeans can produce 82,368 crayons. ETA: Here's a short article on the processing of soybeans into wax. Thanks, mulchandmore, for asking! I didn't know, either. And here's more information on soy silk (not to be confused with soy milk).