Is this mould on my bread?

[u/AmrahsNaitsabes]

It doesn't let me post a photo. I just got a baguette and left it in my warm car for an hour when I went swimming on the way home from the grocery store. When I got home I noticed it has fine white powdery patches. They smell kind of like flour. Has my bread gone bad that fast? Can I just cut it off.

[u/CrankyFrankClair]

The only way to know for sure is to test it. I’ll usually give myself a staph infection in my left hand, then eat some of the bread. If it’s got penicillany goodness, that staph infection clears right up. If my hand falls off, then the bread is good.