There are four reasons: 1. Because it can block light and avoid ultraviolet rays, it is more conducive to the storage of sauce-flavored wine. Direct ultraviolet rays will destroy the acid, ester, and alcohol balance of the wine body, and easily deteriorate the wine body. 2. Due to the thick body of the ceramic bottle, the bottle shape is not beautiful, it is prone to leaks, and the cost is high. 3. The color of Maoxiang wine itself is slightly yellow. Compared with most colorless and transparent liquors, it can be said to be a special existence. This violates people's inherent impression of liquor. People who don’t understand think this is added. What pigmented wine. And the longer it is stored, the yellower the color will become, and some people may think it has deteriorated. Therefore, using an opaque glass bottle can maintain its beauty. People also like this invisible mystery. 4. Maotai-flavored wine will appear white flocculent substance or become turbid at low temperature. This is because the solubility of higher fatty acids in the wine will become low in low temperature environment, so white condensate will appear.