Unanswered Questions

89 questions with no upvoted or accepted answers
18 votes
0 answers
2k views

Research funding for health benefits by coffee trade associations

How much funding is provided by the coffee industry for research on the health benefits of coffee? I came across a statistic that surprised me by its meagerness. According to their website, the ...
7 votes
0 answers
138 views

Empirical data on reuse of grounds, by flow and filter

We wanted to know are there quality empirically generated chemical composition tables examining the relationship between filter porosity, flow by volume per time, and grounds of different varieties?
6 votes
1 answer
77 views

Does hydration level change the effect of caffeine?

Apologies if this question does not belong here, it may be suit for the chemistry site, but it pertains to the consumption of coffee directly -> so here it is. Does your prior level of hydration ...
4 votes
0 answers
38 views

Does anyone know the history of the “washed process?”

Where did the washed process originate and how has it developed and progressed? And what are the different forms and variations it has taken over the years? I have a hunch that it began in Ethiopia ...
4 votes
0 answers
94 views

How can I test or repair my Keurig k45 heating component?

My k-cup coffee maker has stopped making coffee. It's a Keurig K45. It will take water, activate the pump, then it will just stay on the step with the red heating light on. I've let it sit for 15 ...
3 votes
0 answers
17 views

What's the difference between type 2 and 2-5 in the COB green bean classification system?

The Oficial Brazilian Classification (COB) for green beans defines that if 4 full defects are found in the 300 g sample, the source is classified as type 2, but the table says that it's also type 2-5 (...
3 votes
0 answers
68 views

What exactly in coffee causes oxidation and makes it go stale?

I am doing my IB Chemistry HL IA on coffee oxidation, and how varying levels of oxidation (or after an amount of time) affects its pH value. I know that over time it will get more acidic, in which the ...
3 votes
1 answer
148 views

Decipher Lavazza roast/batch code

Can anyone help deciphering Lavazza coffee roasting / batch codes on ground coffee? The bag on the left was great. The one on the right is bad enough I will return the several I bought. Both were ...
3 votes
2 answers
215 views

What is high caffeine coffee in turkey?

I live in Istanbul, I love espresso, but most espresso here are 100% Arabica. Robesta coffee is hard to find. What alternative coffee do you recommend to get the right caffeine during the day?
3 votes
0 answers
86 views

What manual grinders are good

I already have an old rok grinder and I want to upgrade it, but I am not sure what manual grinders are good. The characteristics that I am looking for are mainly: Consistency of grains and general ...
3 votes
0 answers
50 views

Requirements for Nel Drip Coffee

I have a question about Nel Drip coffee requirements. Recently I've been checking few blogs and articles about this type of brewing, it mostly leads to these "settings": - Old coffee beans - Coarse ...
3 votes
0 answers
41 views

Intermittent Bottomless Filter Spray -- Any Suggestions?

I have a Rancilio Silvia and a Breville Conical Burr Grinder. We roast our own beans using a Behmor 1600, and typically do kinda light roasts. Very often, regardless of the bean, roast, packing ...
3 votes
0 answers
900 views

Messy grounds inside of DeLonghi ESAM 2600

I've got a DeLonghi bean-to-cup machine (ESAM 2600), which I find decent in overall. But there is one very annoying issue: not all of the grounds make it from the basket into the internal waste bin. ...
3 votes
0 answers
129 views

What steam wand to replace my Gaggia Carezza old machine?

I have an old model of Gaggie Carezza that can be found here. The steam wand needs to be replaced. Does anyone know which one is suitable? I have been looking at this Rancilio Silvia steam wand but ...
3 votes
1 answer
99 views

Least Expensive Way to Make Decent Espresso-based Milk Drinks?

I want to know the cheapest machines to make decent espresso for my situation. Needs: I need steam for milk drinks I need the proper brewing pressure I need to use fresh ground coffee, no pods ...

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