Can sunfading restore colour?

[Gizmo]

Yes, I've done this, but it's not exactly "restoring" the color but fading the yellowed/brown discoloration that was dulling the original color that was still present. I've found it especially works well with mildew stains that didn't wash out, but I've had success with some other discoloration as well.

For example: the head after sunfading (I later faded the body to match)
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Wow, this is very impressive! Do you have more pictures? And how long did it take?

[hathorcat]

Oh! Cool things to have access to!

I think that will work...although it may even work too well! Its UVA and UVB which we of course all use to sun fade as those are the wavelengths which reach us here, as you mention, UVC cant penetrate due to its wavelength. UVC is the most intense of all 3 [as you know...its used to kill bacteria, mould and other viruses as well as to sterilise - no other UV rays will do that as quickly or efficiently] and even though its not able to penetrate very deeply, because ponies are made from a soft plastic I would suspect it will have no issue with penetrating the plastic at all. If there is no filter on the bulbs you are using, I would think it will work very efficiently because UVC will fade colours and dyes after exposure.

Have fun! And cant wait to hear the results.