1, red: on behalf of hazardous substances, sometimes also marked with orange, hazardous substances, including waste batteries, fluorescent tubes, paint, expired drugs, cosmetics and other non-recyclable and with a certain pollution hazards.
2, green: in the case of a combination of multiple plastic trash cans, green represents food waste, food waste can be used as fertilizer for plant nutrients, soil burial can be decomposed and absorbed by nature's micro-organisms and plants, play a role in the reuse of waste.
3, blue: on behalf of recyclable waste, including plastic, paper, metal and other materials with value, these substances will be included in the waste recycling system, for resource recycling disposal.
4, gray: in addition to hazardous substances and recyclable substances other than garbage, bricks and mortar, ceramics, dirt and other difficult to recycle waste, these substances are generally incinerated, buried and other treatment.
5, yellow: on behalf of the medical waste bin, generally only used in hospitals, health stations and other medical places.