Nalgene 2425 Right-To-Know Wash Bottles meet regulatory labeling requirements for chemical containers and use standard, instantly recognizable symbols and colors. Chemical name, International Chemical Society (ICS) chemical formula and Chemical Abstract Service (CAS) number printed on bottle for easy identification. Color bar that corresponds to colored closure to prevent cross-contamination. These low density polyethylene bottles are flexible for easy dispensing and translucent for viewing contents. Self-venting, but contents stay in bottle with no risk of leakage. Leakproof.