Like all other plants, marijuana leaves, buds, and Kief, too, will go bad. ... Old Kief may go moldy or taste off, but it is not necessarily harmful. Unless you have underlying health problems, you can still use it past its prime time. Bad Kief will taste harsh and brittle.

How can you tell if kief is good?

The purer the kief, the lighter the color will be. If the kief has a greenish color, then it also contains a considerable amount of plant material and therefore is less pure. Kief with an off-white color will be much purer and be by far the better choice.

Can kief grow mold?

Powdery mildew, a form of mold, can sometimes look like dusted kief to the untrained eye. ... Other signs of mold or mildew include dark spots on otherwise green buds, yellow or gray fuzz, or the presence of slime.