Sentences with Darken

He noticed the darken hue of the old photograph, showing its age.

The fabric's color began to darken after being exposed to sunlight for many hours.

The biologist observed how certain fish darken their skin for camouflage.

The stain on the fabric began to darken as it dried, becoming more noticeable.

The darken outline of the mountain range against the sunset was a breathtaking sight.

The firefighter's helmet had a special visor to protect against the darken smoke.

Over time, the wooden fence would darken due to exposure to the elements.