...in case you wanna know why wheels turn yellow,...
in a nutshell:
Wheels turning yellow is actually a sign of good urethane.
You can add so called "UV stabilizers" to the formular which keep your wheels white longer but that also makes the wheels flatspot easier.
The urethane reacts to light ( bright sunlight or just lying around in your room).
Bones Wheels formular has an anti melting agent whcih apparently is respnsible for its true white.
Funny fact, chemically, the bones urethane formular is not as high quality as for example the plan b superthane wheels.
Meaning, once you flatspot a bones wheel there is almost no way to have a nice roll.
High quality wheels will "lose" the flatspot ( unless you were skating a downhill in SF).
Of course it might take some effort to flatspot a bones wheel.
Oh and next time read your subject line before you post,...