Quote Originally Posted by Ravagecat View Post

Do you use a fluorescent bulb in your toy room, old school tungsten screw in, led down light etc. ?
No, the Toy room is kept in constant darkness: No Sunlight and a low density globe is used only occasionally when I go in after dark to look for something. As mentioned, despite the room kept in constant darkness, the toy was completely away from direct light at the very back of a deep mid-bottom shelf (You need to lean down and look in to see it)

Is the room exposed to a lot of dust ?
No, I am the only person living at my place and no pets. The toy room is also not a 'living area', I only go in to take things in or out so minimal dust.

Is the room exposed to natural light ?
Not at all. Blinds are constantly closed and any gaps barricaded by MOTUC mailer boxes.

Does the room get hot during the day ?
Not at all. Overall my place is fairly cool.


Just to mention that it actually took two years to yellow again (wow I didn't realize it had been that long!), it wasn't a sudden thing.


That's why the whole thing seems strange to me. The toy had been kept in constant darkness ever since I whitened it. My guess is that although sunlight (artificial light) may expedite the process, yellowing can occur despite of it just for being exposed to air.

As we know, some plastics are more prone to yellowing than others so maybe some will mostly be affected by sunlight while others just need to be exposed to air to yellow.