Impression, take away
1 definition found for this term.
Definitions are presented in the order source books were published (most recent first).
An impression that is created when surface contact is made, but instead of a deposit occurring, something (e.g., dust) is removed from the surface. For example, as a hand is removed from a dusty surface, the dust adheres to the friction skin, creating a void on the surface. The resulting detail is reversed, in that the dust-free area of the impression is replicating the friction ridges, and the remaining dust, the furrows.