The pollen of the marijuana plant is called “kief” and it has a very high concentration of thc. This is actually what hash is: compressed kief.
Some grinders have a filter screen to a second compartment that is used to seperate the kief from the rest of the buds, and collect it separately.
Inthese types of grinders, putting a coin in the bud compartment will help shake lose the kief out of the buds to collect it.
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