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I can only guess that the 2000 deg F aluminum gas flashed the dye and you are seeing the combustion product stuck to the glass.? It may only be a few atoms thick.? Who knows, it may be graphine ! ! ! ! ! ? ??

It sound silly but flash combustion staining can happen.? My 28" f/1.05 full thickness mirror fresh back from rework went into my chamber for coating.? It was precision clean upon entry.? Due to the very improbable coincidence of my wife turning off the coolant water to the diff pump coolant jacket and the thermal cutoff switch not actually cutting off and there not being any oil vapor cold traps above the diff pumps.... there was a vanishingly thin ( not visible ) fog of vacuum oil in the chamber from the diff oil getting too hot.? It contaminate the mirror without my knowing it.? I ran the aluminization and was reduced to incoherent babbling when I opened the chamber. ? Upon stripping the coating with green river and cleaning with foaming dawn detergent, then calicum carbonate then cleaning and rinsing again and again, blowing a little breath fog on the mirror brought the damage out every time.? Seen below is breath on the mirror acting as a fog water break. ?

Nothing short of wiping the mirror surface down with a soft wet cloth dripping wet with very watered down jewelers rouge and distilled water remove the surface contamination.? The re-coat was flawless and no hint of the contamination could be seen. ? ? ?

Not saying this is what happened to your mirror, but that dye is carbon based and aluminum gas ( however little of it there is ) is seriously hot. ?

Drew in rainy Florida

ps..... all the things that led up to my surface getting trashed with oil have been 200% fixed.? There is now dual redundant safety everything when it comes to them nasty diff pumps.