brown stain meaning

[Architecture]

A chocolate brown stain produced by fungus in the sapwood of some pine trees.

Examples

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1. Are your kids'teeth sprouting white spots or brown stains?
2. My beautifully painted walls are getting all kinds of brown stains.
3. The latex tends to impart brown stains on whatever it contacts.
4. Its wings are of yellowish-green colour with brown stains.
5. The knots are bleeding through, lighter than the dark brown stain.