Colorado Revised Statutes Title 25. Health § 25-17-103. Labeling and coding

On or after July 1, 1992, no person shall distribute, sell, or offer for sale in this state any plastic bottle or rigid plastic container manufactured on or after July 1, 1992, unless the product is labeled with a code indicating the plastic resin used to produce the bottle or container. Plastic bottles or rigid plastic containers with labels and basecups of a different material shall be coded by their basic material. Such code shall consist of a number placed within a triangle of arrows and letters placed below the triangle of arrows. The triangle shall be equilateral, formed by three arrows with the apex of each point of the triangle at the midpoint of each arrow, rounded with a short radius. The arrowhead of each arrow shall be at the midpoint of each side of the arrow. The triangle, formed by the three arrows curved at their midpoints, shall depict a clockwise path around the code number. The numbers and letters used shall be as follows:  1 = PETE (polyethylene terephthalate), 2 = HDPE (high density polyethylene), 3 = V (vinyl), 4 = LDPE (low density polyethylene), 5 = PP (polypropylene), 6 = PS (polystyrene), 7 = OTHER (includes multi-layer).