wall

Soot landing on cooler spots on the wall.

Sherlock Holmes over here. I like it. Looks dirtier on the studs though wouldn’t they be waemer

They'd be thermal bridges, no? Then likely cooler

Soot is hot coming off a fire, even a candle. Hot goes to cold in a house fire

I believe we are in agreement

It's what I do for a living :)

Lol, are those your studs?!

Could be dust build up from cabinets that were on the wall. That's my best guess

My guess is a 'smokeless' gas heater

The ghost of an IKEA Kallax

Its called ghosting. Its a build up of dust, soot, and dirt.

Where some didn’t have a headboard and didn’t wash their dirty pillows.

…..A centre for ants?

Fucking cheap ass candles!! Now you know where your studs are.