Message:

<p>[QUOTE=&quot;brg5658, post: 1300567, member: 29751&quot;]Doug, you are right that such items fade.&nbsp; But curtains, carpets, rugs, furniture, paper, stamps, etc. all fade because of degradation of either organic compounds (proteins) or because of degradation of polymers (fibers and plastics).&nbsp; This degradation is NOT limited to light from the UV spectrum (&lt; 400nm), and these items are NOT made of metal.&nbsp; Have your pots and pans suffered &quot;fading&quot; because of UV light?&nbsp; I doubt it.&nbsp; </p><p><br /></p><p>As for your other comment, MOST UV light IS blocked by ordinary pane glass.&nbsp; Not all, but more than 90% of radiation less than 300nm is blocked.&nbsp; More of the UV spectrum from 300-400nm can pass.&nbsp; If you want an example of this in practice, &quot;transition lens&quot; glasses will NOT work behind any standard soda-lime glass (window glass).&nbsp; These glasses &quot;transition&quot; because of UV light, and work in direct sunlight but not in cars (for example).&nbsp; As another example, test tubes used in spectrophotometry specifically do NOT use standard glass (window soda-lime glass) because it blocks UV light.&nbsp; They use a more expensive quartz-silica glass that is transparent to UV light.&nbsp; So despite your draconian and dogmatic statement of my being &quot;100% wrong&quot;, I beg to differ.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in