While a label may say 100 percent silk, for instance, the fabric might contain a small amount of another fiber, causing streaks during the dyeing process.

Too much fluoride swallowed during the early childhood years may cause white, brown, or black spots or streaks on the outside of the teeth (fluorosis).

Static electricity, the book says, can cause spots, streaks or blotches on your pictures.

Its partial blocking of the room light caused wavy streaks of blackness along the floor, and even added a patch of gloom upon the wall near the writing table.

Severe infections cause grey necrotic streaks and result in the death of the plant.

Be sure to wet the siding under the window thoroughly first, so the dirty water will run off easily; on a dry surface it will cause streaks.

Sagging or clogged gutters are unsightly and can overflow, causing streaks.

Spraing is a disease of potato tubers that causes brown streaks in the flesh of the potato.

Too much paint on a single pass will cause runs and streaks.

Dropouts are faults in the magnetic coating that cause streaks in the recorded image.