Sweat beaded on his pale face, darkened his thin mustache.

Sweat darkened the khaki of his uniform shirt under the arms.

Sweat darkened the collars on both men's uniforms.

Sweat had darkened her short brown hair to a black fringe around her square little face.

Sweat darkened his brown hair almost to black.

Sweat sheened on his skin and darkened his shirt.

Sweat darkened his shirt under his arms and on his chest.

Sweat darkened his shirt and trickled down his cheeks.

Sweat studded his face and darkened his tunic under the arms.

Sweat streamed down his face and darkened his shirt at the back and under the arms.