Kief: the trichomes themselves.

What kief actually is

Kief (pronounced keef) is a collection of loose trichome heads — the tiny resin glands that coat the cannabis flower. Each head holds the cannabinoids and terpenes the plant produced. When the heads break off and gather, that powder is kief. No solvent touched it, no press squeezed it. It's the raw material that every other solventless concentrate starts from.

Why it collects in your grinder

Grinding flower knocks trichome heads loose. In a three-chamber grinder, the heads fall through a mesh screen into the bottom compartment — the kief catcher — while the ground flower stays above. Over time, that bottom chamber fills with a fine, pale powder. That's not dust or debris; it's the most resin-dense part of what you ground.

Kief vs. hash

Kief is the loose powder; hash is what happens when that powder gets pressed. Same starting material, one extra step. Dry sift (from the hash article) is essentially kief collected deliberately through screens instead of accidentally in a grinder.

Color tells a rough story: pale, blonde kief is mostly clean trichome heads. Greener kief has more broken-up plant material mixed in — it fell through the screen along with the heads. Neither is a lab result, but the color is honest about what you're looking at.