The effect of some kinds of acid, alkali and salt on the transparency and viscosity of gelatin, which are usually used, is studied in extractive gelatin.
研究了明胶提取过程中，几种常用酸碱盐对明胶透明度和黏度的影响。
2
It USES distilled water and alcohol to refine water soluble acid and alkali of sample and then test the extractive with PH indicator.