I put an irish bar's baileys into my morning's black coffee I kept warm in a Stanley thermos. But after an indeterminate amount of time (between 10 mins to an hour), some of the milk curdled.

Is that normal? Should I have been concerned? Is it because my coffee turned out that acidic?? We use a french press and preground beans. I haven't taken a look at where he buys his bean grounds, but offhand it tastes like a medium roast.

  • 2
    When you say "an irish bar's baileys" do you mean it's a house-made irish cream liqueur and not the name-brand Baileys Irish Cream produced by Diageo?
    – The Photon
    May 8, 2019 at 20:40
  • 1
    Most likely it's brand name; I haven't peered at their liquor rack from the right angle. I'm new to bars and pubs so I'm unsure what information is relevant
    – Corty Moto
    May 8, 2019 at 20:50
  • Is it the kind of bar that sells a lot of Baileys? (Meaning, do you think it's been on the shelf less than a week, or it could have been there for a couple of years)
    – The Photon
    May 8, 2019 at 20:53
  • 1
    I think milk can curdle when something acidic is introduced. Coffee is acidic
    – Craig
    May 9, 2019 at 15:09
  • 1
    Well also alcohol can curdle milk Jun 18, 2019 at 19:17


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