Questions tagged [extraction]

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10
votes
1answer
1k views

What do the terms extraction and strength mean?

A number of questions use the terms extraction and strength in a broad sense like "how much stuff comes out of the coffee beans." But "technically" speaking: What do the terms extraction and strength ...
40
votes
1answer
2k views

How will “cold brewed” coffee differ from traditional hot-water extraction methods?

Generally speaking, what do "cold brewed" methods hope to achieve compared to the more traditional hot-water methods of extraction? Does the amount of caffeine vary between hot brewed and cold ...
7
votes
1answer
421 views

When to use stirring to increase extraction?

I often find that some methods of brewing for a particular implement differ on whether or not to stir the grounds at some point in the process. I understand that stirring while brewing should ...
6
votes
1answer
218 views

How to make Turkish coffee in a syphon?

I've been experimenting with my Syphon to make turkish coffee, my thoughts on the matter are that using the syphon without a filter would allow the water to boil, move to the upper chamber, let the ...
4
votes
2answers
56 views

Could light transmittance be used to timely determine extraction?

I was wondering if I could get perfect extraction timing by measuring the light transmittance (of course with the same coarseness of grind) like a Beer's law sort of thing. Anyone have any readings? ...
4
votes
6answers
16k views

Why does my moka pot sputter?

I have an old 6-cup moka pot (bialetti) that I recently replaced the filter and the rubber gasket (bialetti brand), however the extraction time seems a bit long, bubbles to soon(almost immediately) ...
4
votes
2answers
783 views

Options for measuring TDS - Suggested refractometers

I'm looking for some options for measuring TDS. Everything seems to point back to the VST Refractometer, but at $700+ I'd like to try some other options first. I founds a low cost TDS meter on ...
4
votes
1answer
646 views

Are there any Alternatives to using a Refractometer to determine extraction

Wondering if anyone has used a refractometer or knows of any other method to measure a coffee extraction (or dissolved solids)?
2
votes
1answer
131 views

How much volume of the shot should pre-infusion take up?

The espresso machine I use at work has a pre-infusion step. I've been wondering if the volume of the pre-infusion affects the shot, especially the pressure of the main extraction.
0
votes
1answer
228 views

How to keep the time before coffee get out of the machine?

I just bought a Nuova Simonelli Musica + Eureka Mignon, so I'm practicing extracting a shot. I am trying to make the extraction lasts 25 sec. But when I start the extraction, I first have ...