Which of the following statements about a pesticide deposit is NOT true?

A pesticide deposit refers to the residue left on surfaces after a pesticide has been applied. The correct statement in this scenario is that a deposit is visible only after application. In reality, pesticide deposits may not be visible immediately after application, as they can be very fine and may blend into the surface they are applied to. Therefore, it is important to understand that deposits can sometimes be difficult to see right after application due to factors like the formulation of the pesticide and the nature of the surface.

The other statements discuss valid characteristics of pesticide deposits. Pesticide deposits can indeed vary in visibility based on formulation and application methods, and they can remain on surfaces for extended periods after application, depending on environmental conditions, the type of pesticide, and the nature of the surface. Additionally, the term "deposit" does refer to what remains after application, but visibility can depend on multiple factors, making the first statement the one that is not true.