this post was submitted on 08 Mar 2024
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[Outdated, please look at pinned post] Casual Conversation
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I thought the sheen was from oils naturally present in the beans.
That was my understanding, as well. I can only report to you what I observed.
Maybe something present in the tapwater allows more oil to be drawn out?
Former barista here! This is what that is. Different machines using different roasts, water, settings, etc. will extract differently, resulting in different oil amounts.