Originally Posted by T.G

A number of molds, possibly all, will fluoresce when under UV from a blacklight, even if the colony isn't visible under normal light.

Learned this the "OMG! I've been breathing THAT? I am so out of here." way due to a former landlord that wouldn't properly maintain his properties.

I have no idea though if plume, certain capas or even the pectin will or won't fluoresce also.