How to identify non-toxic and non-toxic and environmentally friendly bags?

Sensory test: non-toxic non-green bags milky white, translucent, or colorless transparent, flexible, feel lubrication, surface like wax; non-toxic bags cloudy or yellowish color, feel sticky.
Water detection: the non-green bags placed in the water and press into the bottom, the proportion of non-toxic and non-small bags can be surfaced, non-toxic and environmentally friendly bags heavy, sinking. Jitter detection method: Hold the end of non-green bags shaking force, issued by the crisp sound non-toxic; muffled toxic astringent.
Fire detection: non-toxic polyethylene bags flammable, flame was blue, yellow top, burning like a candle, like tears dripping with paraffin smell, smoke less; non-toxic PVC bags is not flammable, from the fire is put out, the flame is yellow, the bottom of the green, softening can be brushed with hydrochloric acid, pungent odor.