Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: In search of fading pigments
okitew
Harmless
*




Posts: 3
Registered: 19-4-2019
Member Is Offline


[*] posted on 19-4-2019 at 00:19
In search of fading pigments


I'm looking for a pigment that will permanently disappear upon exposure to light/UV, say after a few hours.

Ideally, this pigment will be dark initially, cheap, and nontoxic. Any ideas?

The best option I've found so far is chlorophyll, but I need something darker that will fade more quickly.
View user's profile View All Posts By User
Mr. Rogers
Hazard to Others
***




Posts: 179
Registered: 30-10-2017
Location: Ammonia Avenue
Member Is Offline

Mood: No Mood

[*] posted on 21-4-2019 at 13:42


Nope! I never signed that contract!! See...
View user's profile View All Posts By User
okitew
Harmless
*




Posts: 3
Registered: 19-4-2019
Member Is Offline


[*] posted on 23-4-2019 at 03:49


Quote: Originally posted by Mr. Rogers  
Nope! I never signed that contract!! See...

lol.... Nice.

But no, I actually need it for an obscure photography application.

Actually, I'll go so far as to say that it would be key to a new photographic process, and that I'd share that process with whoever submitted a workable solution, and if they think it's worth patenting, I'll support submitting it as a joint patent.

Disappearing ink won't work afaik because it must fade from light exposure only while dry.

[Edited on 23-4-2019 by okitew]
View user's profile View All Posts By User
phlogiston
International Hazard
*****




Posts: 1262
Registered: 26-4-2008
Location: Neon Thorium Erbium Lanthanum Neodymium Sulphur
Member Is Offline

Mood: pyrophoric

[*] posted on 23-4-2019 at 05:38


rhodopsin
methylene blue

You can also combine a radical-generating photoiniatior (eg benzoylperoxide, hydrogen peroxide, azobisisobutyronitrile, titanium dioxide) with an organic dye sensitive to radicals.

You may find this paper interesting:

Photoassisted bleaching of dyes utilizing TiO2 and visible light
Epling GA et al (2002) Chemosphere 46:561-570

http://nathan.instras.com/documentDB/paper-253.pdf




-----
"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer
View user's profile View All Posts By User
okitew
Harmless
*




Posts: 3
Registered: 19-4-2019
Member Is Offline


[*] posted on 24-4-2019 at 11:05


Quote:
Quote: Originally posted by phlogiston  

methylene blue

Why didn't I think of that? What can't that stuff do?
Quote: Originally posted by phlogiston  
You can also combine a radical-generating photoiniatior (eg benzoylperoxide, hydrogen peroxide, azobisisobutyronitrile, titanium dioxide) with an organic dye sensitive to radicals.

You may find this paper interesting:

Photoassisted bleaching of dyes utilizing TiO2 and visible light
Epling GA et al (2002) Chemosphere 46:561-570

http://nathan.instras.com/documentDB/paper-253.pdf

This is useful. Thanks!
View user's profile View All Posts By User

  Go To Top