Indicators are substances that change colour when they are added to acidic or alkaline solutions. Universal indicator is the indicator most commonly used in the laboratory. If universal indicator is ...

Acid/base indicators are described and used to identify substances as acids or bases. Indicators and the pH Scale: Acid/base indicators are described and used to identify substances as acids or bases.

Figure 1: Comparison of the labelling efficiency in vitro and within the E. coli cytoplasm. Figure 2: Toxicity of Cu(I) complexes inside E. coli cells. Compartment-specific pH indicators derived from ...