Discoloration on Safari Orthacanthus and Stethacanthus

[Eocarcharia]

My Safari Orthacanthus and Stethacanthus from the prehistoric sharks toob have gotten a strange yellow-green color on them. I've only had them on my shelves; they haven't been in contact with any dirt, paint, or any other substances. As far as I can tell, only these two are affected. I don't see anything like this on any of the oher sharks, or on any of my other figures. Is it some kind of mold?









Anyone know what this is?

[Flaffy]

My ones have this issue as well, and I have no idea what these yellow botches are either.
I tried removing them but ended up leaving scuffs on my Orthacanthus, so I just left them as is.

[CityRaptor]

Looks like it could be a case of photodegration aka yellowing:
https://tfwiki.net/wiki/Photodegradation
Although I don't think it affects painted areas. So maybe something with the paint?

[Dinoguy2]

Looks like it could be a case of photodegration aka yellowing:
https://tfwiki.net/wiki/Photodegradation
Although I don't think it affects painted areas. So maybe something with the paint?

It seems to be present on both painted and unpainted areas (or are these fully painted?). That makes me think chemical leeching like the kinds that causes sticky figures is to blame here since that would probably make it through microscopic pores in the paint from the underlying plastic.

[stargatedalek]

I can confirm this is almost certainly unrelated to sticky plastic, mine have been like this for years and are still fine. It's a purely aesthetic yellowing that happens to some white plastics and white paints over time, you should be able to safely paint over it or "remove" it if you scrub off the paint (assuming it's happening tot he paint and not the plastic).

[Justin_]

I've got this on the underside of a couple of Schleich sharks which I've had since 1999. I wonder if the surface they are sitting on could be an influence?

[Eocarcharia]

Thanks for the help everyone. So it would seem to be a problem inherent to the paint and/or plastic. Maybe I'll try painting over them.

I've got this on the underside of a couple of Schleich sharks which I've had since 1999. I wonder if the surface they are sitting on could be an influence?

I don't think that's the case, at least with mine. The discoloration is present on areas that were not in contact with shelves or anything else, like the Stethacanthus' sides.

[stargatedalek]

I've got this on the underside of a couple of Schleich sharks which I've had since 1999. I wonder if the surface they are sitting on could be an influence?

It's caused by UV light. Typically this process is uniform and takes years unless exposed to direct sunlight, which is what makes me think it's happening to the paint  this instance and not the plastic.