Quartet at the end of plastic bags

Non-toxic Quartet plastic packaging bags identification method:
One, with the eye observation method Quartet plastic packaging bags transparent or slightly transparent, uniform texture; but toxic for the color, but the transparency is poor, more turbid, plastic surface tension is uneven, with small particles.
Second, with the ears to listen to the hand shake the four square at the end of plastic bags, issued a crisp sound that is non-toxic; and the sound is small and boring is toxic.
Third, touch the hand touch the bottom of the plastic packaging bag surface, very smooth is non-toxic; sticky, astringent, waxy sense of the toxic.
Four, with the nose smell non-toxic Quartet at the end of the plastic bag is tasteless; irritating smell or taste is not normal is toxic.
Note: Our company Sifang at the end of plastic bags are used HDPE high-quality environmentally friendly plastic, non-toxic harmless, you can feel at ease!