<p>The process of roasting causes both physical and chemical changes in the bean. If you haven't before, watch a video. You'll see the process of roasting produces a lot of smoke. Now think of the idea of inconsistent roasting. This is just another way of saying that some of the stuff that's in that smoke will still be in some of the beans compared to average. Also, the chemical changes caused by the heat will be underdone for some beans and overdone in others, meaning no two inconsistent batches will produce the same extraction.</p>

<p>These factors all affect what compounds water extracts and in what quantities. They will therefore affect the flavor of the coffee beverage by way of affecting the extraction.</p>

CC BY-SA 4.0
2020-05-02T02:58:21.067Z
2020-05-02T02:58:21.067Z
R Mac
<p>That's a tricky one.</p>
<p>It depends on what do you mean by 'extraction'.</p>
<blockquote>
<p>&quot;Coffee extraction is the process of dissolving soluble flavors from coffee grounds in water&quot; - from <a href="https://en.wikipedia.org/wiki/Coffee_extraction" rel="nofollow noreferrer">Wikipedia</a>.</p>
<p>&quot;Extraction is everything that the water takes from the coffee&quot; - from <a href="https://baristahustle.com/blog/coffee-extraction-and-how-to-taste-it/" rel="nofollow noreferrer">BaristaHustle</a>.</p>
<p>&quot;To remove or take out something&quot; - from <a href="https://dictionary.cambridge.org/pt/dicionario/ingles/extract" rel="nofollow noreferrer">Cambridge dictionary</a>.</p>
</blockquote>
<p>Therefore, the extraction process considers dissolving the flavors. An uneven roast will affect directly the flavours on the final beverage. Thus, even the perfect extraction will not be able to extract all the flavours it could if the beans weren't correctly roasted.</p>

CC BY-SA 4.0
2019-12-04T02:10:35.323Z
I'm sorry but I don't see how you go from these definitions to your conclusion. How does an uneven roast affect the flavors in the final beverage?
JJJ
CC BY-SA 4.0
2019-12-03T18:09:57.283Z
2019-12-03T18:55:51.597Z
2020-06-18T08:36:22.093Z
Gabriel Duarte
<p>I'm not really asking about flavour, I understand that an inconsistent roast causes  inconsistent flavour. </p>

<p>My question is how it affects the extraction itself. Does an uneven roast lead to an uneven extraction? Or does it not really matter?</p>

<p>We can assume other variables are consistent, i.e. a good tamp and a consistent brew temperature within the ideal range for espresso extraction.</p>

<espresso><brewing-process><extraction><roast>
Does an inconsistent roast affect espresso extraction? If so, how?
JJJ
# Does an inconsistent roast affect espresso extraction? If so, how?

(Asked by: username_0 on 2019-05-24)

I'm not really asking about flavour, I understand that an inconsistent roast causes inconsistent flavour.

My question is how it affects the extraction itself. Does an uneven roast lead to an uneven extraction? Or does it not really matter?

We can assume other variables are consistent, i.e. a good tamp and a consistent brew temperature within the ideal range for espresso extraction.

**Tags:** espresso, brewing-process, extraction, roast


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## 2 answers

### Answer by username_1 on 2020-05-02. Score: -1

The process of roasting causes both physical and chemical changes in the bean. If you haven't before, watch a video. You'll see the process of roasting produces a lot of smoke. Now think of the idea of inconsistent roasting. This is just another way of saying that some of the stuff that's in that smoke will still be in some of the beans compared to average. Also, the chemical changes caused by the heat will be underdone for some beans and overdone in others, meaning no two inconsistent batches will produce the same extraction.

These factors all affect what compounds water extracts and in what quantities. They will therefore affect the flavor of the coffee beverage by way of affecting the extraction.


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### Answer by username_2 on 2019-12-03. Score: -1

That's a tricky one.

It depends on what do you mean by 'extraction'.

> "Coffee extraction is the process of dissolving soluble flavors from coffee grounds in water" - from [Wikipedia](https://en.wikipedia.org/wiki/Coffee_extraction).
>
> "Extraction is everything that the water takes from the coffee" - from [BaristaHustle](https://baristahustle.com/blog/coffee-extraction-and-how-to-taste-it/).
>
> "To remove or take out something" - from [Cambridge dictionary](https://dictionary.cambridge.org/pt/dicionario/ingles/extract).

Therefore, the extraction process considers dissolving the flavors. An uneven roast will affect directly the flavours on the final beverage. Thus, even the perfect extraction will not be able to extract all the flavours it could if the beans weren't correctly roasted.

> **Comments:**
> **username_0**: I'm sorry but I don't see how you go from these definitions to your conclusion. How does an uneven roast affect the flavors in the final beverage?  

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