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Do you mean the rust fungus that plants get? Why do you think you might have one?
Do you use a disinfecting soak for your appliance?
It just really strongly reminded me of rust fungus from microbiology text, but as that was a long time ago, and I didn't try to use a microscope to examine it, and as you say there are other similar things (color & texture), it's quite possible it's something else.It could be one of these other species
Has your orthodontist seen it?