detectable

This term describes a threshold of perception, often implying that something is present but perhaps only just barely. It is frequently used in scientific, forensic, or technical contexts to indicate that a substance or signal has reached a level where instruments or human senses can confirm its existence. In a social or behavioral context, it refers to subtle cues or changes in mood and tone that are perceptible to an observer. It suggests a transition from the invisible or hidden to the observable.