Quote:
Originally Posted by Guy N. Heels  UV light resides in the 250 nm range and is fairly easily blocked, even by ordinary glass. |
Not strictly true!
Ultraviolet C resides at around the 250nm range, The Sun emits ultraviolet radiation in the UVA, UVB, and UVC bands, but because of absorption in the atmosphere’s ozone layer, 98.7% of the ultraviolet radiation that reaches the Earth's surface is UVA. This as you know resides around the 400 nm – 315 nm wavelength. but this is all scientific blar blar, not something I try to blind people with
to prove the damaging effect not keeping your white patents/PVC's in a dark place, Take a piece of white paper or newspaper, tear it in half. Place one piece where ever you would leave a pair of shoes, say by your back door but in natural light. Or behind a window to exaggerate the experiment.
Place the other half in your closet or a box out of light in a cool dry place as suggested.
Now leave them for a week or two!
I'd be willing to put money on it that after a week or two when you put them together again they WOULD be different colours, even with white paper. why? because that UV light is the worlds natural bleach!
Lee