I found out the hard way, back in the 80's, when I bought a burner from 3 rivers. They said to get Alcohol from the drug store. I did, and it didn't....burn that is!
My wife's uncle, a mechanic since birth, said I needed, Denature Alcohol. He said when he was in the Service in Korea, they had stoves which they used it in. Burns clean and hot! Yep, it worked!
At the time, Hooks Drug store, didn't have the higher content of Ispropyl available! Now I have seen higher content, as of late, 80%, which will burn.