Litmus paper indicators in blue color are used to check the acidity of a solution.
The blue paper indicator is used for acidity testing since it turns red in an acidic environment with the color change occurring over a pH range of 4.5 - 8.3 at 25 °C (77 °F).
Litmus blue indicators are supplied in a package of 100 pieces. Each package contains 100 papers in 2 bundles of 5.
You can test whether a solution is acidic or basic by using Litmus indicator.
The Litmus paper indicator is available in 2 types:
- Blue Litmus Papers
- Red Litmus Papers
Note that Litmus papers are not used to determine the pH of a solution, but to check acidity. The pH papers are intended for the determination of the pH of a solution.