Crema - a scientific perspective

[MrJack]

Just stumbled across a very interesting paper (a literature review) about Crema.

Some very interesting information, and looks to be some equally interesting papers referenced.

Even better is accessible to anyone on ResearchGate:
Neglected Food Bubbles: The Espresso Coffee Foam. - ResearchGate

[MrJack]

I should mention, it's pretty dry and technical in parts, but there are some insightful comments too (and not just at the end).