Unit of purity

KARAT

["**Hint:** \"Measure for gold's fineness.\"\n\nThis hint guides the solver toward the context of gold and its quality without directly stating \"purity\" or \"karat.\" It’s easier than the original clue but still requires the solver to connect \"fineness\" to the concept of purity measurement."]

The clue **"Unit of purity"** leads to the answer **"KARAT"** through the following reasoning: - **Definition**: A **karat** is a unit used to measure the purity of gold, with 24 karats representing pure gold. This directly ties to the idea of "purity." - **Alternative Spelling**: While "carat" is also a valid spelling (often used for gemstone weight), "karat" is the preferred term in the U.S. for gold purity, making it the more likely answer in this context. - **Wordplay**: The clue is straightforward, relying on the definition rather than cryptic wordplay, but it plays on the dual meaning of "karat" (purity vs. gemstone weight). Thus, the answer fits perfectly as a **unit of purity** for gold.