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yep; the good news is neither type of mark will spread to other ponies, the bad news is there's really no way to make them go completely away or prevent them.The brownish ones will lighten with cleaning, sometimes, but pinkish or orange stain looking spots won't. Make sure to keep her in a cool dry place, if you can, that might keep them from getting worse, I think?
Just to make sure you get the right answers...are we talking about the pink regrind mark or the faint brown dots? The dots do look like age marks unfortunately. They are caused by plasticisers breaking down and oil in the plastic unfortunately.
If the marks are fully coming off with acetone, they're not likely to be age marks - those may lighten (slightly) with cleaning but they never disappear. Perplexing. o_o Not sure what it could be, the picture is rather ambiguous. Acetone is indeed safe for use on vinyl, very much not safe for paint/flocking/glue.
I think my bestie and I had these on some of our ponies when we used to play with them back in the day. they'd have a dark mark, which came off, but with a light stain beneath. However I haven't seen these marks on the ponies since I unpacked them again several years ago now, after being in storage for 4-5 years. The marks just faded away, or came off on my initial cleaning when I got them out again. I wouldn't stress, while they do look like age spots, apparently they aren't? The ponies weren't exposed to cigarette smoke that you know of, by any chance?
I know these, too. To me, they are a kind of mold but then again, not really mold. Like a crossing of mold and age marks, I always thought of them as a problem of age that will always recur even if treated with acetone. I myself would store the pony in a place as dry as possible in order to prevent it going on. Will follow this thread in case anyone knows more.
Perhaps she was exposed to some type of spray/splatter which was initially clear, but caused a reaction to the plastic/dye or the environment? I don't know what it could be, but there are lots of potential sources from cleaning products to biologicals. The different texture and the fact that they all popped up within a few weeks plus the fact it's cleanable with acetone would suggest some type of surface contamination. It could be mould/fungal if the initial spray was something organic that it would find tasty, since vinyl itself isn't something mould can consume.
If the marks are coming back, it does sound like some sort of VDS / age spots - it's entropy, there is no stopping it, sadly. You can treat the symptoms (sometimes) but it's the nature of an unstable compound material to break down with age. Proper storage conditions will slow the process down, that's about all that can be hoped for.
I think unfortunately it does sound like some kind of age mark - they come in all manner of degrees. So you will no doubt manage to remove the surface discolouration which will have leaked on to the out of the plastic. The more deeply ingrained discolouration could be an issue but as long as you keep an eye on it you will be able to treat if and when it creeps back. TTT is one of those girls a prone to age marks unfortunately so to have one with minimal issues is great