MindWare, of Roseville, Minn. voluntarily recalled about 2,200 Animal Tracking Explorer Kits because the powder in the kit marked "plaster of paris" is actually calcium hydroxide, which poses a risk of skin and eye irritation to children using the product. The recalled "Animal Tracking Explorer Kit" includes a bag of white powder marked "plaster of paris" which is actually calcium hydroxide. It also includes nature study tools and equipment (field lens, specimen jars and bags, labels, puff bottle, plastic gloves, spatula, cardboard strips, paper clips, mixing pot, tweezers, spoon, notebook) and Explorer Guide. These products were sold through the company's 0Web site, www.MindWareOnline.com, and by MindWare's catalog from September 2007 through December 2007 for about $25.