What is used to determine characteristics of water by visually comparing a sample, to which a specified indicator solution has been added, to a color standard?

• A. Bacon bombs
• B. The DPD kit
• C. Dippers
• D. Kemmerer bottles

Answer: (B)

The main idea here is colorimetric testing: you add a reagent that reacts with a target substance in the water, producing a color whose shade is matched against a color standard to estimate concentration. The DPD kit uses the indicator DPD; when chlorine is present, it forms a pink color. You then compare that pink against a provided color chart to determine the chlorine level or other chlorine characteristics. This makes the readout quick and visually straightforward without needing instruments.

Other options are tools or methods, not the color-based indicator kit. Sampling bottles or dippers are for collecting or handling samples, and while bacon bombs have historical use in chlorine testing, they aren’t the commonly used color-compare kit described here.