What are the two types of 2-D impressions?

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Multiple Choice

What are the two types of 2-D impressions?

Explanation:
Two-dimensional impressions on flat surfaces can appear in two forms: positive and negative. A positive 2-D impression shows the actual ridge pattern directly on the surface—the ridges themselves are visible as the imprint. A negative 2-D impression is the inverse: the spaces between the ridges define the pattern, producing a print that looks like the opposite of the ridge flow. Whether a print appears as positive or negative depends on how material is transferred or displaced during contact, and recognizing both forms helps in choosing the right lighting, angles, and enhancement methods to reveal the pattern.

Two-dimensional impressions on flat surfaces can appear in two forms: positive and negative. A positive 2-D impression shows the actual ridge pattern directly on the surface—the ridges themselves are visible as the imprint. A negative 2-D impression is the inverse: the spaces between the ridges define the pattern, producing a print that looks like the opposite of the ridge flow. Whether a print appears as positive or negative depends on how material is transferred or displaced during contact, and recognizing both forms helps in choosing the right lighting, angles, and enhancement methods to reveal the pattern.

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