Greenhouse: Potential problem with Harbor Freight greenhouse panels?, 0 by oldmudhouse

oldmudhouse wrote:
Here's a photo of my 18" scrap (only exposed to one month of sun) held up to my roof panels. I sprayed the roof with distilled water to wash off any dust. Not sure if you can see it in the photo as well as I can see it in person, but I can see the beginnings of a change. The scrap retains the original blue-clear color, but the panels on my greenhouse appear slightly less clear, and more yellow in tone.

This is after 7 1/2 months in southern New Mexico sun (intense sun much of the year) with occasional temps over 100°. I'll take more pics periodically to record any progression.