So i have a century bottle circa 1970s that i just can't seem to fade. When i first got it the liquid was such a dark yello it you could barely see the red wax while flowing. I think someone at some point dyed the liquid yellow as it looks like they added way too much dye? I dont think i have ever had this much of an issue sun fading a lamp before, especially yellow. This has sat out in the sun almost every day since april, and although it has faded enough to be able to enjoy while running, i still wish to make it a clear red if possible. Besides that it flows like brand new.