What does 2-color reporting indicate?

2-color reporting is a method used in various laboratory analyses that helps to differentiate between two categories of results. In this context, it indicates "True and Apparent." This terminology is essential in water quality and laboratory analyses because it allows analysts to distinguish between values that represent the actual concentration or presence of a substance (true values) and those influenced by other factors or conditions (apparent values).

For example, in the context of turbidity measurements, true values might refer to the actual particulate matter suspended in water, while apparent values could include interference from other substances or conditions that may alter the measurement representation. Understanding this distinction is crucial for practitioners to interpret the data accurately.

In contrast, the other options focus either on specific types of measurements, such as suspended solids or dissolved solids, or different properties like viscosity and conductivity, which do not encompass the broader implications of true versus apparent values central to 2-color reporting.