no it means it was an incomplete combustion causing pure Carbon (carbon monoxide or sut).
Soot (carbon) and carbon monoxide - as opposed to full combustion which results in water and carbon dioxide
Both amorphous carbon (lampblack) and graphite are used as black pigments.
When methane is heated strongly, it undergoes a process called pyrolysis, breaking down into simpler compounds like carbon and hydrogen. This can result in the formation of volatile hydrocarbons, carbon black, and even soot.
Incomplete combustion of carbon-containing compounds, such as hydrocarbons, can lead to the formation of black residue due to the production of elemental carbon (soot). This soot is responsible for the black color seen in the residue.
The black lump is mostly carbon. Normally I would expect to find some partial combustion byproducts as well, since combustion is rarely 100% efficient.
... will also result in formation of carbon monoxide, formaldehyde (methanal), methanol, carbon black.
Carbon deposits
An incomplete combustion give off black carbon particles.
Incomplete combustion occurs when there is insufficient oxygen present to fully burn the fuel. This leads to the production of soot, carbon monoxide, and other harmful byproducts. These byproducts can accumulate and create a messy residue, such as black carbon deposits or soot, which can stain surfaces.
carbon monoxide
carbon result of incomplete combustion.
Cyclohexane is an alkane and it burns in air with an orange flame and black sooty smoke. The orange flame indicates incomplete combustion. This means there is a lack of oxygen in the air for all the carbon in the alkane to be converted into carbon dioxide (which is complete combustion) so some carbon and carbon monoxide is formed which is the black sooty smoke (incomplete combustion).
The yellow sooty flame is a sign of incomplete combustion in the bunsen burner, which produces carbon particles (soot) along with carbon monoxide. When a porcelain dish is placed in the flame, these carbon particles can deposit on its surface, leaving a black residue. This residue is mainly composed of carbon.
Soot (carbon) and carbon monoxide - as opposed to full combustion which results in water and carbon dioxide
Water and carbon are byproducts of combustion. Its all good...
Both amorphous carbon (lampblack) and graphite are used as black pigments.
Carbon black is typically darker than ebony. Carbon black is a black pigment made by the incomplete combustion of natural gas or oil, resulting in a deep black color. Ebony is a natural wood that is usually dark brown or black in color, but not as deep or pure black as carbon black pigment.