Over the decades of smoking cuban cigars, and a lot of vintage well cared for cigars from the 60s-70s-80s I've never seen "plume" I've seen "dust" on cigars usually out of old balsa boxes and to me it was just balsa dust, i have seen what's called "stripper glitter" that is a yellowish crystal structure on the cigars, it's very sparkly under a light or out in the sun, i have a box of 1970s LFDC Selectos in cello that have it on them, i take one a year with me to a socal cigar herf with friends as something of a conversation peace and to smoke. If I'm feeling not lazy later i'll dig out the box and take a video under light, pictures don't really show it off in it's glory, have to roll it back and forth. Sage wisdom says it's sugars and oils in the wrapper that crystallized, not mold looking, not "plume" or "bloom" or any other such thing. It's still cool though LOL