I thought that oil sheen (sometimes looks like an oily skin; you'll see sometimes on stagnat water) was a bacteria. Probably grows on some of the nutrients in the water. In this case the nutrients and compounds from the coffee brew.
All (I would say) plant matter has types of nutrient components (just most plants have non digestable or unlockable nutrients relative to normal animals). Take for instance termites eat wood but its some enzyme or bacteria in their stomach that actually helps in the digestion conversion to energy.
Still coffee bean (which is a seed?) appears to have harvestable quantities of nutrient based oily value. Wonder where it will end up on yield vs the peanut, sunflower, canola or other plant.
Wonder if the bacteria helps harvest the nutrients out of the coffee???
Glad to see more and more research looking for alternatives. It would be nice to see various sources of bio oil production so as to balance cash crops world wide. Not just one species would be good to grow everywhere.
