Pyranine
From Sciencemadness Wiki
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Pyranine fluoresces green in neutral conditions and blue in acidic conditions.
Pyranine is a yellow arylsulfonate dye, commonly found in highlighters, that exhibits strong fluorescence.
Contents
Properties
Chemical
The fluorescence of depends on the pH of the solution, which makes it a fluorescent pH indicator. At low pH levels, the color of its fluorescence changes from green to blue. It also acts as a regular pH indicator, and turns from yellow to colorless at the same low pH levels.
Physical
Pyranine is highly soluble in water.
Acquisition
Relatively pure pyranine can be found in highlighters and used as a pH indicator.
Preparation
Projects
- "Radioactive" color-changing baking soda volcano
- Lava lamp
Handling
Safety
Pyranine has low toxicity.
Storage
It should be stored in closed containers.
Disposal
Pyranine can be safely poured down the drain.
