Why is a smoke ring red?

[Rob O]

Hi guys. Been away for a while then once I got back didn't have anything worth posting. Hope everyone's well.

Anyway, I was wondering why is a smoke ring red? Why not brown or grey or any other color for that matter?

 

[Russell Y]

Smoke Ring One

Smoke Ring two
According to this article, more humidity causes more of a smoke ring. So, if you use a water pan with water, it looks like you should get more of a smoke ring.

Smoke Ring three

Good question. Answers thanks to google.

Russell