thymolphthalein การใช้

Thymolphthalein, which is normally colorless, turns blue in solution with the base.
Disappearing inks typically rely on the chemical reaction between thymolphthalein and a basic substance such as sodium hydroxide.
Thymolphthalein is used for the same purpose and in the same way, when a blue color is desired.
Other examples are phenolphthalein and thymolphthalein, colorless in acidic to neutral pH, but becoming pink and blue in alkaline environment.
Several indicators share a similar structure to phenol red, including bromothymol blue, thymol blue, bromocresol purple, thymolphthalein, and phenolphthalein . ( A table of other common chemical indicators is available in the article on pH indicators .)