For high-aspect-ratio structures the resist-developer system is required to have a ratio of dissolution rates in the exposed and unexposed areas of 1000:1.

When exposed though a negative, the gum-gelatin hardens where light strikes it while unexposed areas remain soft.

The plate is then developed and the unexposed areas are washed away, leaving behind cured emulsion that will hold the ink on press.

These unexposed areas consisted of now present states Florida to Mexico.

In slide film, the two dyes that attach to the unexposed area combine to form the color captured at the exposed layer.

The wafers are then exposed to short-wave ultraviolet light and the unexposed areas are thus etched away and cleaned.

The unexposed areas around the images are washed away with water and soft scrubbing brushes.

Once exposed, the sensitized material is washed in soapy water to remove dye from unexposed areas.

The exposed screen could then be developed to wash away the unexposed areas (i.e. those shielded by the artwork), producing a stencil screen.

A condition called pityriasis rosea that causes a slightly scaling, pink, raised rash over the trunk and unexposed areas of the body.