What are little black sand shaped particles in a window frame which has holes in it?

Answer

might be fly poop.

Answer

If it's a WOOD window frame, with small holes visible in the wood surface and the "black sand shaped particles" are piled up in small areas, then you should consider checking for termites.

Termite trailings are usually visible as small piles of particles resembling the size and texture of course beach sand. The color of the trailings will vary depending on the age and type of wood involved.

Termites in pine wood will have lighter colored trailings due to pine's lighter shade; in contrast, the termite trailings from a darker wood like walnut or mahogany will be much darker than the pine trailings.

 

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