If a brewer uses a permanent metal filter instead of paper, what is the chemical consequence regarding oil content?
Answer
The coffee becomes chemically closer to French press coffee in terms of oil content
Reusable metal filters, whether in a pour-over cone or certain drip machines, function mechanically more like the mesh found in a French press than a dense paper filter. This is because the metal filters allow a significant quantity of the oily diterpenes, cafestol and kahweol, to pass through suspended in the brewed liquid. Consequently, the resulting chemical profile of the coffee in terms of retained oils and diterpene load mirrors that of coffee brewed with a French press, contrasting sharply with the low-oil content of paper-filtered coffee.
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