This looks like sticky-shed to me, not mold. Sticky-shed is a specific deterioration of magnetic tape that makes it unplayable, but it would be safe to keep as a display piece. You could try baking the tape but it’s kind of a trial and error process.
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Thats super cool, even as just a display piece
bummer about the mold, if you want to watch it though you can see it on Youtube.
[https://www.youtube.com/watch?v=mtI0o41BgCM](https://www.youtube.com/watch?v=mtI0o41BgCM)
This looks like sticky-shed to me, not mold. Sticky-shed is a specific deterioration of magnetic tape that makes it unplayable, but it would be safe to keep as a display piece. You could try baking the tape but it’s kind of a trial and error process.