Eraser
["1 envelope unflavored gelatin", "1 Tbsp. flour", "3 Tbsp. water", "1 Tbsp. cleaning powder (like Comet)"]
["You will need wax paper (3 x 6-inch), stapler or tape, saucepan and potholder, rubber spatula and plastic wrap."]
["unflavored gelatin", "flour", "water", "cleaning powder"]