Litmus Paper -

It cannot differentiate between weak and strong acids (e.g., pH 1 vs. pH 3). It is also susceptible to interference from other substances in a solution that might affect the dye's appearance.

Generally do not change the color of red or blue litmus paper, though dedicated purple litmus paper exists for this purpose. Types of Litmus Paper litmus paper

), the paper must be with distilled water first so the gas can dissolve and produce ions. It cannot differentiate between weak and strong acids (e

Standard testing requires careful handling to avoid contamination. litmus paper

There are three main variations used in laboratories and educational settings: