Photo Reactive Dye: Irreversible Change in Presence of Light

[Mechdude]

Homework Statement

im trying to identify photo reactive dye/ compound that changes color when exposed to light, i know of photochromic dyes, unfortunately photochromic dyes undergo a reversible change in appearance. is there a compound that changes in the presenc eof light irreversibly?

Homework Equations

The Attempt at a Solution

 

[berkeman]

Homework Statement

im trying to identify photo reactive dye/ compound that changes color when exposed to light, i know of photochromic dyes, unfortunately photochromic dyes undergo a reversible change in appearance. is there a compound that changes in the presenc eof light irreversibly?

Homework Equations

The Attempt at a Solution

I Googled irreversible photochemical reactions, and got some good hits. Do any of these help?

http://www.google.com/search?source...1US302&q=irreversible+photochemical+reactions

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[Ygggdrasil]

Look up caged dyes or photoactivable dyes.

 

[Mechdude]

thanks berkeman, & Ygggdrasil nice name though i can't pronounce it, that's what i was looking for.
regards.