1. Red: represents harmful substances, sometimes also marked in orange. Hazardous substances include waste batteries, fluorescent tubes, paint, expired drugs, cosmetics and other substances that are not recyclable and carry certain pollution hazards.
2. Green: In the case of various combinations of plastic trash cans, green represents kitchen waste. Kitchen waste can be used as fertilizer for plant nutrients. After being buried in the soil, it can be decomposed by natural microorganisms and plants. Absorb and play the role of waste reuse.
3. Blue: represents recyclable garbage, including plastics, paper, metals and other valuable materials. These materials will be included in the waste recycling system for resource recycling and disposal.
4. Gray: In addition to garbage other than hazardous substances and recyclable materials, waste that is difficult to recycle, such as bricks, ceramics, and dirt, is generally incinerated, buried, etc.
5. Yellow: represents a special trash can for medical waste, which is generally only used in medical places such as hospitals and health stations.