It is produced by the reduction of fuchsin by sulfurous acid, and is oxidized by aldehydes and ketones, restoring the magenta color of the fuchsin.
配法是用亚硫酸使品红溶液还原，若有醛酮类存在时便使之氧化而重新呈现品红本身的洋红色。
The content of dialdehyde starch was determined by spectrophotometry with the color agent alkaline fuchsin - sulfurous acid.
以碱性品红-亚硫酸为显色剂，用分光光度法对双醛淀粉含量的测定条件、灵敏度、回收率进行研究。
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