The cave walls bore faint sulfur impressions left by ancient volcanic activity.

Researchers debated whether maternal impressions could influence a child's temperament.

The museum displayed several artists' impressions of the newly discovered fossils to help visitors imagine their appearance.

The investigator documented the witness's present sense impressions about the scene before memories could fade.

Even after the music stopped, an after-impression of warmth lingered in the room.

The chemist created a sulfur impression of the delicate insect to preserve its features.

The scientist examined the sulphur impression left on the rock to determine the area’s volcanic history.

I was under the impression that the meeting started at nine, so I was surprised when no one was there.

Because no photographs survived, the archaeologists commissioned an artist's impression of the lost temple for the exhibit.

Her presentation makes an impression on the company's executives.