On Tue, 25 Nov 2003 17:19:54 -0500, "Ray"
wrote:

One of the problems with most aerogels is their ability to absorb pollutants
out
of the air. As all plastics are porous, it's only a matter of time until it
discolors.
..................... Isn't that what they used to do with
whitewash on glass walls?

SuE
http://orchids.legolas.org/gallery/albums.php