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Kerosene is a heavy mixture of hydrocarbons. Burning it creates water vapour, carbon dioxide (carbon monoxide in low oxygen conditions) and soot (unburnt carbon).
It usually means too much fuel or not enough spark.
Possibly the boiler is firing oil and thus the soot from the oil is spilling back into the gas flue
Yellow soot is obtained when the holes of the burner are not clean. The combustion is incomplete. The yellow soot or yellow flame is because of unburnt carbon particles.
Soot particles are the result of incomplete combustion of carbon or organic compounds.
Usually as the chimney is blocked, mainly by a build-up of soot from previous fires.
It produces less soot. Kerosene is refined one more time then petrol and so this makes it more pure. Its like comparing olive oil and extra virgin olive oil.
To much oil in fuel .sparkplugs build soot on them
burning oil
There are many things that produce soot. The burning of coal or wood produces soot. In prior years, individuals would hire chimney sweepers to clean the build up of soot from their fireplaces and chimney flutes.
Kerosene is a heavy mixture of hydrocarbons. Burning it creates water vapour, carbon dioxide (carbon monoxide in low oxygen conditions) and soot (unburnt carbon).
aerosols and soot from air polution
Soot blowing is done in air pre heater by a blower called swing blower which is different from half retractrable or full retractable or deslagger.
Very ,very ,very dangerous condition called SPILLAGE
most likely, too much fuel.
Either a chem dry sponge or I have used Awesome (that you can get from the dollar store) plus a magic eraser.. spray and then scrub with that, then wipe with a dry paper towel. You may want to test it on a small inconspicuous place on your wall first. I have used this on walls in a modular home and this seems to work best.
The only thing wrong with doing this is that kerosene tends to smell a little more than lamp oil and will produce more smoke and soot. But it will burn in a lamp just like the more refined lamp oil.