1. Brief introduction of decolorant mechanism of various adsorbent decolorants is made, and research achievements on it in recent years are summarized.

2. Mechanism of color development of organic compounds, chemical decolorant mechanism and decolorant reagents are introduced, some decolorant methods are summarized.

3. The adsorptive and decolorant capability of attapulgite clay on soluble anion dyes was studied.

4. Useage:Mordant agent, water repellent, oil decolorant. It is also used in leather and paper industries.

5. The color in different ages and parts of bamboo wood was analysed, and the decolorant effect of bamboo wood from treating with H_2O_2 was also tested.

6. Food products are used as acid neutralizer and peeling agent, decolorant and deodorant in the foodstuff industry.