A few days ago I got an 'Espresso' maker made out of Aluminium (one of these).
At the moment I am experimenting a bit with it, but I noticed something strange. The base (the part where you put the water in) turned dark from the inside. Is this normal or bad, maybe even dangerous? Do I need to clean it? If so: How do I clean it?

1 Answer 1


What you've got there, is a Moka pot. They are unable to produce the amount of pressure that gives the Espresso its character, in particular the crema.

I have owned several, and all of them have had this happen. That has had no impact on the flavour or mouth feel.

  • 2
    Thank you for the answer! I know that they don't make real Espresso, thats why I've written 'Espresso' wrapped in quotation marks ;-)
    – Sven
    Commented Jun 15, 2014 at 10:32
  • 1
    Oh, absolutely, I assumed as much. Still, I thought it was worthwhile to point it out for the benefit of other users, who may or may not know the peculiars.
    – razumny
    Commented Jun 15, 2014 at 21:53

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