Soot coming from a heating source that's not operating properly. Have all heating sources checked by a professional to locate problem. Have this done ASAP. Soot will cause other damage besides around edge of carpeting.
Strearks on roof
Black lines in banana bread are typically caused by overripe bananas that have oxidized and turned dark during the baking process.
The small brown bug with lines on its back is likely a carpet beetle.
The black lines mean it is a state boundary.
You say "his arm" but whose arm are you talking about?
woodland tree frogs brown with a black pach around there eyes and some times black spots and lines. by Tyson
A loose baby tooth that is turning gray or black is a dead tooth. A dentist can take the tooth out.
Drawing Black Lines was created on 2000-03-21.
Black Lines to Battlefields was created on 2003-05-20.
The answer is the Temperature.
Black sludge in water lines can be caused by the accumulation of organic matter such as algae, bacteria, or mold. It can also be a result of corrosion of metal pipes, especially if the water is acidic or contains high levels of minerals. In some cases, the sludge may be due to the growth of biofilm on the inner surfaces of the pipes. Regular cleaning and maintenance of the water lines can help prevent the buildup of black sludge.
The best car carpet shampoo is the Zep Premium Carpet and Upholstery shampoo. I would also use a spot remover from Malaseb, Kirby or Folex product lines to remove tough stains..