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1·A brown or metallic green dye, C20H 12o 7, used as a pH indicator and in dyeing textiles.

一种棕色或金属绿色染料，C20 H 12o 7，用作酸碱指示剂和用于给丝织物染色。

2·It USES distilled water and alcohol to refine water soluble acid and alkali of sample and then test the extractive with PH indicator.

用蒸馏水或乙醇水溶液抽提试样中的水溶性酸或碱，然后用酸度计或指示剂对抽提物进行测定。

3·Taking alcoholicity as the indicator, the effects of initial sugar content, initial pH, inoculum size and temperature on the fermentation of the wine were investigated.

以酒精度为指标，研究了初始糖度、初始酸度、接种量和发酵温度对凉薯果酒发酵的影响；

4·A method of abstracting plant pigment as alternate indicator was described, and the change of colour at different pH ranges in various plant pigmentes was measured.

本文综述了黑色素的理化性质和生理功能，以及林木植物黑色素的分离制取方法，并就黑色素的研究和应用进行了展望。