In the presence of some special surfactants such as Arabic gum, polyvinyl alcohol or their mixture, the associated ion is soluble in water, accompanied with very sensitive color change.
在某些特殊型表面活性剂，如阿拉伯树胶、聚乙烯醇或其混合溶液的存在下，离子缔合物溶于水，并伴有极灵敏的颜色变化。
Cellulose gum: a water soluble gum derived from wood fibre cellulose, used as a substitute for lithographic gum Arabic and synthetic gums.
纤维素胶：由木纤维获得的纤维素胶；可溶于水，用来代替阿拉伯胶或合成胶。
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