Although this may look strikingly similar to a cobweb or spiderweb that has been covered in soot, it is not! This is a soot web, or soot tag, and is one of the most visible instances of fire damage. Soot webs are formed from ionized soot particles clinging together! They most commonly form in corners or confined spaces with low circulation. Soot from smoke traveling through the air is looking for cooler temperature areas and in doing so, the particles are actually joining together to create these webs! Although they look scary, there are no spiders that come along with them and no, you don't have that many cob-webs in your house that you aren't seeing! Minimal fire or smoke damage can go unnoticed. If you come across any soot webs, refrain from touching them- they are very stick and transfer onto just about anything leaving behind a black mess.