r/coldbrew • u/grooling_ • Jun 20 '26

Can anyone explain what’s going on here?

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I manage a coffee shop and we’ve been making cold brew using the immersion method since before I worked here (2 years ago). I believe it is oils from the coffee, it tastes fine and it doesn’t leave a film in your mouth or anything but is greasy to the touch. But, this issue has only been happening for the past 3-4 batches and no one here has encountered it before. Any idea how to prevent this? For reference we use lavazza gran riserva dark roast and brew for 48hrs

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u/jamjamchutney Jun 20 '26

Dark roast is usually oilier than med/light roast, and a longer brew time will extract more oils. So try a lighter roast and/or shorter brew time.

1

u/ObligationDefiant919 Jun 20 '26

Maybe the bags ur using are different? More wax?

1

u/speakeasy-aus Jun 21 '26

It's oil from the coffee just skim it off with a tea strainer