Cornmeal (yellow)

Finely ground: Strain through a fine-mesh strainer, such as a tea
strainer. Spread out what remains in the strainer on a white surface
and check it for insects or sticky webbing.
Coarsely ground: Spread out in a thin layer on a white surface and
check for small insects, worms, or sticky webbing.
If infestation is found, the product should not be used.