石蕊测试纸火石红卷JT0350 200纸（1卷）

[Features]
●Discoloration: When the red test paper comes into contact with an alkaline liquid, it will turn blue.●This is an acidity and alkaline test paper that is particularly popular for schools and teaching materials, and does not require pH values.●Therefore, there is no need to compare/match it on a color scale (discoloration chart)
●There is a book type with a plastic case (10mm wide x 60mm long, packed with 20床单/书籍X 10本书）和带有单 盒装的塑料分配器的卷型（7mm宽x 5m卷）。