Crystal Caffeine – Angel Hair

Caffeine is released during roasting. Some of this caffeine crystalizes on the outside as the smoke escapes.

Temperature Probe Setup on HotTop Roaster

This is a HotTop roaster. The yellow devices on top are temperature probes. As the roast progresses, smoke escapes from the probe holder. Over time, amazingly intricate white crystal structures appear. These caffeine crystals are know as angel hair in coffee jargon.

Caffeine Angel Hair formed on the bean temperature probe handle

These are microscope shots of the crystals after removed from the probe.

Caffeine Crystals under a microscope

Same cluster under higher power.

Caffeine Crystals under higher power