A look of horror twisted Grof's features and made his spots darken.

The spot will darken as dye accumulates in the gelatin layer.

The spots and stains left by fluorosis are permanent and may darken over time.

Earth and sky turned around me and black spots darkened my sight.

Damp spots and a rivulet of water darkened the concrete.

For a moment it was merely exposed skin, and then an oval spot darkened and turned black.

Fifty yards away, an enormous dark spot on the hull, one of the ship's vision devices, swelled and darkened.

These spots enlarge and darken over time, developing a velvety or cracked texture in the center of the lesion.

She saw his hand was starting to sweat, spots of wetness darkening there, inside the white rubber glove.

A damp spot had darkened the material from gray to black.