On Jan 27, 3:13*am, Jeff Liebermann wrote:
On Mon, 26 Jan 2009 22:26:58 -0500, "NoSPAM"
wrote:



Titanium dioxide is a very bright white. *It reflects the ultraviolet, as
well as visible and near-infrared.
(...)
Carbon black is added as an absorber of ultraviolet.

So, the difference is that titanium dioxide reflects UV, while various
black pigments absorbs UV. *Ok, that makes sense. *Thanks.

I would bet that red PVC tape lasts for only a short time in sunlight.
Most organic red pigments are destroyed rather quickly by ultraviolet
light, a real problem for automobile paint. *There is a reason for Clear
Coat beyond its looks!

Yep. *One of my non-clever neighbors painted their house candy apple
red. *Besides being rather garrish, the paint lasted about 2 years
before fading rather badly. *They had to sandblast and re-prime in
order to start over with basic beige.

Incidentally, one of my former neighors was a painting contractor. *He
painted his house with the left overs from various jobs. *None of the
colors matched. *Not exactly an eyesore, but close.

I have some red electrical tape. *I'll give it a try on the roof and
let you know after summer.

--
Jeff Liebermann * *
150 Felker St #D * *http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann * * AE6KS * *831-336-2558

I have found that just about any of the colored marking tapes dont
hold up well outdoors.