1. Labels. The label shall appear on the bottom of the plastic bottle or rigid plastic container and be clearly visible. This label shall consist of a number with letters placed below the number. The numbers and letters shall be as follows:
A. For polyethylene terephthalate, the letters "PETE" and the number 1;
B. For high-density polyethylene, the letters "HDPE" and the number 2;
C. For vinyl, the letter "V" and the number 3;
D. For low-density polyethylene, the letters "LDPE" and the number 4;
E. For polypropylene, the letters "PP" and the number 5;
F. For polystyrene, the letters "PS" and the number 6; or
G. For any other plastic resins, including multilayer, the letters "OTHER" and the number 7.
2. Alternative labels.