36 votes
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How will "cold brewed" coffee differ from traditional hot-water extraction methods?

Cold Brew Coffee - A Brief look at Flavor Profiles My company builds flavor profiling and quality control tools for the craft beverage industry, using machine learning, data science, and analytical ...
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  • 1,681
10 votes
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Can caffeine be extracted by the body when digesting coffee grounds?

Yes. Coffee grounds are simply the ground up seeds found inside the berry of the coffea plant, so eat up! Even after the beans have been ground and extracted into your favorite coffee beverage, they ...
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10 votes
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What do the terms extraction and strength mean?

Though I don't generally like to cite Wikipedia as my primary reference, it does in this case have a pretty good overview of terms related to coffee extraction, re-summarized here: Extraction: The ...
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  • 8,497
7 votes
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Hario V60 Plastic Dripper vs Ceramic Dripper: Is there any difference in brew quality?

The main difference between the ceramic and plastic V60 is heat retention. The ceramic will retain heat and can be pre-warmed, creating a stable temperature. Depending on who you are this may not make ...
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  • 521
6 votes

Can you use sparkling water to brew coffee?

If you heat the water as per most brewing methods, it would no longer be carbonated/sparkling by the time you brewed with it. You would thus be confined to a cold-brew method, and if you wanted the ...
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  • 841
5 votes
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Why does some coffee "hit me" harder than other coffee?

There are a number of concrete factors that will impact the stimulation you get from a cup of coffee, but it probably boils down to the amount of caffeine (and any other stimulants) that are in your ...
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  • 8,497
4 votes
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How to reduce sourness in my moka-pot brew?

What I immediately notice is that you say the entire brew process takes only 5-10 seconds. Even for a 1-pot moka, this seems way too fast. Vary some other parameters: Start with cold water in the ...
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  • 8,497
4 votes
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When to use stirring to increase extraction?

Stirring should be used if the grounds were not evenly dispersed in the beginning of the process for some reason (in immersion brewing methods). For instance, when I am using my pour over at work, if ...
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4 votes
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Does using two paper filters in a drip machine strengthen flavour?

Yes, because it allows more time for coffee to be extracted as it stored in a longer time for coffee to drip. However, other parameters also have effect regarding this issue (such as, type of bean, ...
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  • 64
4 votes
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What does over-extracted taste like?

Yes, over- and underextracted are quite different from weak or strong coffee. The strength is determined by the amount of grounds, more grounds = stronger coffee. But that’s not what your recipe is ...
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  • 3,853
4 votes
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Troubleshooting Moka coffee grind size vs sediments

A Moka grind is a tad coarser than espresso grind and ideally finer than standard pour over. If it’s too fine, you’ll see the excessive sediments or - worst case - even clogging up. The size of the ...
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  • 3,853
3 votes
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How to make Turkish coffee in a syphon?

I, being a native Turkish and experienced Turkish coffee drinker for my life, quite conservative about this. There will be some major problems on producing the genuine Turkish-style with a syphon. ...
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  • 7,583
3 votes

Hario V60 Plastic Dripper vs Ceramic Dripper: Is there any difference in brew quality?

I believe the previous answers have it backwards. Plastic is less conductive and will retain more heat in the slurry. The simple way to test this is to touch the side of the V60 during a brew. The ...
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3 votes
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How does one calculate extraction percent?

You have everything right. If you want Extraction % you need to measure: Total dissolved solids: You will have to measure this using a refractometer. There are many out there, for commercial settings ...
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  • 2,139
2 votes

Ideal Way to control shot extraction with Gaggia Classic

The best way to control of shot extraction without adding excessively complicated electronics (if by PID you mean proportional-integral-derivative controller) is: How fine is the bean grounding (the ...
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  • 581
2 votes

Hario V60 Plastic Dripper vs Ceramic Dripper: Is there any difference in brew quality?

To add onto the previous answer, the main difference is indeed heat retention and cleaning. The ceramic will hold heat longer and is easier to clean. It is also more breakable. I recently wrote a ...
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2 votes

Why does my moka pot sputter?

I have the answer! Like many others, the gasket (O-ring washer thing) on my trusty moka pot was starting to disintegrate after years of stove-top brews. I carefully checked the size I needed and ...
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2 votes

Why does my moka pot sputter?

Folks - please be aware that there are at least two different thicknesses (not talking diameter) for Moka pots. I know that Bialetti makes gaskets in at least 2 different thicknesses. If your Moka ...
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  • 29
2 votes

What acids are there in coffee?

Funny I should come across this topic tonight, as I'm reading a book right now about the science behind making coffee as a commodity, a beverage and an art form. One particular sentence from the book ...
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2 votes

What acids are there in coffee?

Note: I leave out a lot of the details of espresso shot extraction and just mention the major points of troubleshooting so don't flame me =p Acidity is always tricky when you talk coffee because ...
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  • 1,354
2 votes

Can you use sparkling water to brew coffee?

The other issue you'll run into is that sparkling water is actually pretty acidic, and that's going to change the overall extraction process as well. If you want sparkling coffee, make cold brew and ...
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2 votes
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Are there any Alternatives to using a Refractometer to determine extraction

I guess measure density just like you would in a college-lab? Just use a graduated cylinder. Extraction is mostly about how efficiently you can extract coffee solubles with an amount of liquid. Since ...
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2 votes

Can you use sparkling water to brew coffee?

Good coffee is extracted via highly measured methods, methods that attempt to always replicate uniform extraction. Blooming is a step taken in drip/pourover and sometimes full immersion methods to ...
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  • 1,291
2 votes

Could light transmittance be used to timely determine extraction?

Refractometers are widely used to measure the opaqueness of the coffee during brewing to timely determine the extraction time. Spectrophotometers are used to measure color instead of opaqueness. They ...
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  • 7,583
2 votes

How does one calculate extraction percent?

The extraction percent of coffee could be calculated with a Petri dish, stove and a precision scale, if you don't have access to a refractometer. I assume, the original question here is: How does one ...
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  • 7,583
2 votes
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What is the best way to clean a refractometer?

I'm sure there are instructions on maintenance and cleaning in the refractometers manual. However with distilled water and soft towels/tissues and/or Q-tips for the edges (be careful not to scratch ...
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  • 2,139
2 votes

Single shot extraction time in Breville Barista Express

The problem seems like either in the dosage or in the tamping force or in the grind size. First, I advise you to use freshly roasted beans. I don't know what is the pressure value at 12 o'clock ...
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  • 7,583
2 votes

Can you make good, evenly extracted espresso with a single basket?

Yes. If you're willing to accept a bit of increased workflow hassle, the La Marzocco 7g basket with an inner straight-walled cylindrical bit (or one of its derivatives) works very well. To use this, ...
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  • 139
2 votes

My coffee isn't acidic enough?

To add to cabmeurer's answer, I think a big reason for the lower levels of acidity in your drip coffee when compared with other methods (pour-over, Aeropress, etc.) comes down to temperature. This ...
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  • 39
1 vote

How could I improve extraction and yield more coffee when brewing with a filter?

Actually, this is implicitly answered here or here. Percolators have mechanisms to re-brew and re-brew coffee till eternity. You can continue or stop the process whenever you want. That's why, ...
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