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 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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.

"JIMMIE" wrote in message
...

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

I assume you mean tapes like surveyors use as well as temporary tapes
printed with "Police Line" or "Caution." These are generally made of
polyethylene because it is so inexpensive. Exposed to ultraviolet light,
polyethylene is destroyed quickly.

To add to something "Dave" said, Dacron is DuPont's name for their brand of
poly(ethylene terephthalate) polyester fibers. Other fiber names are
Dacron, Diolen, Fortrel, Kodal, Tergal, Terylene, and Trevira. I have seen
hamfest dealers charging considerably more for Dacron rope just because of
the name. Likewise Mylar is DuPont's name for PET film, but PET films are
also known as Terphane, Hostaphan and Melinex by different manufacturers.

--
73, Dr. Barry L. Ornitz WA4VZQ

[transpose digits to reply]

On Jan 27, 7:33*pm, "Dr. Barry L. Ornitz"
wrote:
"JIMMIE" wrote in message

...

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

I assume you mean tapes like surveyors use as well as temporary tapes
printed with "Police Line" or "Caution." *These are generally made of
polyethylene because it is so inexpensive. *Exposed to ultraviolet light,
polyethylene is destroyed quickly.

To add to something "Dave" said, Dacron is DuPont's name for their brand of
poly(ethylene terephthalate) polyester fibers. *Other fiber names are
Dacron, Diolen, Fortrel, Kodal, Tergal, Terylene, and Trevira. *I have seen
hamfest dealers charging considerably more for Dacron rope just because of
the name. *Likewise Mylar is DuPont's name for PET film, but PET films are
also known as Terphane, Hostaphan and Melinex by different manufacturers.

--
73, Dr. Barry L. Ornitz *WA4VZQ

[transpose digits to reply]

Sorry I thought I had quoted Jeff and it was understood I was talking
about PVC electical tape.

Jimmie