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Bureau of Interior Conditions
Division of Environmental Threats & Hazards

Advisory BIC-ETH-0106

Status: In effect

Beverage reclassification advisory — dark-roast coffee, sensory profile approaching combustion residue
SubjectAdult consumer of commercially marketed dark-roast coffee
Primary concernSensory misclassification — combustion residue presented as brewed beverage
Exposure modeCafé default order, office drip dispenser, hotel lobby urn, gas-station carafe
Observed effectMid-sip recognition that the flavor is closer to a finished cigarette than to coffee
Basis for reportSustained multi-vendor, multi-method sampling. No isolated incident.

After sustained sampling across the commercial coffee distribution network, the Bureau has determined that a substantial subset of beverages currently marketed as “coffee” have crossed a sensory threshold beyond which they no longer differ, in any practical respect, from the residue at the bottom of a public ashtray. The category in question is dark roast. The category problem is that, after sufficient time over heat, the bean ceases to express any of the molecules ordinarily associated with the bean and begins to express only the molecules associated with the bean having become charcoal. At that point the beverage is, for sensory purposes, ash water served warm.


Across reviewed samples, the following flavor signatures were recorded with high consistency. None of them are coffee.

2.1  Charred wood — top note, immediate, occupying the position where roasted-bean character would normally appear.

2.2  Wet ash — mid-palate, recognizable as the specific dampness of a cigarette extinguished in liquid rather than in air.

2.3  Sour burn — rear of the mouth, a low-grade chemical sting indicating the bean has been pushed well past the point of any remaining usefulness.

2.4  Final-millimeter butt — the flavor of a cigarette in its closing stages, after the filter has begun to absorb what the tobacco had been holding back.

2.5  Tin and dust — finish, suggestive of a pot that has remained on the warmer for several hours after the last drinker left the building.

2.6  Absence of bean — across all markers, no detectable signature of the originating coffee plant. The Bureau notes that this is the significant finding.


The Bureau has logged a recurring event in which the subject, mid-sip and expecting morning fuel, abruptly recognizes the flavor in question as belonging to a different sensory category entirely. The subject typically pauses the sip without swallowing, holds the liquid in a state of suspended judgment for one to three seconds, and then either swallows under ambient social pressure or disposes of the cup quietly once unobserved.

The pause is brief. It is, however, the moment at which the subject has correctly identified the product. Most subjects recover the prior framing within seconds and resume drinking. The Bureau records this recovery without endorsing it.


The Bureau has reviewed the language used to market this class of beverage. Words encountered, in approximate order of frequency: bold, rich, intense, full-bodied, dark, deep, smoky, roasty, smooth. With the exception of “smoky,” none of these words refer to combustion. All of them are being used, in this context, to refer to combustion. The Bureau notes that the word “bold” is currently absorbing more semantic load than it was designed for and finds the strain visible.

The roast itself has been, in industry terms, a triumph of language over chemistry. The bean has been informed it will be respected and has then been incinerated. The customer has been informed they will receive a premium experience and has then been served the same flavor profile available to anyone who tips a cigarette tray into a kettle.


For Bureau purposes, dark-roast coffee meeting or exceeding the sensory threshold described in Section 2 will no longer be recorded as coffee. It will be recorded as combustion residue, beverage form. The originating bean will continue to be acknowledged in invoicing only. Vendors marketing such products as “coffee” are not in violation of any Bureau rule, as the Bureau does not regulate commerce.


Subjects who taste cigarette butts in coffee marketed as bold are not unsophisticated. They are not failing to appreciate craft. They are correctly identifying ash. The Bureau recommends they trust the reading and order accordingly.