this post was submitted on 08 Mar 2024
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[Outdated, please look at pinned post] Casual Conversation
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You know the little oily colorful sheen on the top of a cup of coffee?
At one point just at random I made a pot of coffee from a jug of distilled water I had, instead of the filtered tap water.
It had no little colorful sheen.
I have no idea if it's a big deal or not, but it made me legitimately concerned.
Filtered water will extract less due to a lack of trace minerals.
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.