What do you think of soot?

When we light a cigarette and see something, our ash is divided into all kinds.

But as an ordinary person, you can't see it, mainly because you don't have the relevant channels, that is, there is no master to take you in, so you can't see any shape you have.

More importantly, you need relevant people to see this. Even if it is the same gray, everyone will see different results, so this thing is inconclusive.