Photo Reactive Dye: Irreversible Change in Presence of Light

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In summary, the conversation is about identifying a photo reactive dye or compound that changes color when exposed to light. The person is aware of photochromic dyes, but is looking for a compound that undergoes a permanent change in appearance when exposed to light. Some suggestions were given, such as searching for irreversible photochemical reactions and looking into caged or photoactivable dyes. The person thanking the others for their help.
  • #1
Mechdude
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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

 
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  • #2
Mechdude said:

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

.
 
  • #3
Look up caged dyes or photoactivable dyes.
 
  • #4
thanks berkeman, & Ygggdrasil nice name though i can't pronounce it, that's what i was looking for.
regards.
 
  • #5


There are indeed photo reactive dyes that undergo an irreversible change in the presence of light. These dyes are known as photochemical dyes and they undergo a chemical reaction when exposed to light, resulting in a permanent change in color. Examples of photochemical dyes include diazo dyes, sulfur dyes, and azo dyes. These dyes are widely used in various applications such as photography, printing, and textile dyeing. It is important to note, however, that the irreversible change in color may not be instantaneous and may require a certain amount of time or specific conditions to occur. Additionally, the exact compound that would be suitable for your specific application would depend on factors such as the desired color change, type of light exposure, and the material the dye will be applied to. It is recommended to consult with a chemical supplier or conduct further research to determine the most suitable photochemical dye for your needs.
 

Related to Photo Reactive Dye: Irreversible Change in Presence of Light

1. What is photo reactive dye?

Photo reactive dye is a type of dye that undergoes a chemical reaction when exposed to light. This reaction causes a permanent change in the color of the dye.

2. How does photo reactive dye work?

Photo reactive dye contains molecules that are sensitive to certain wavelengths of light. When these molecules are exposed to light, they undergo a chemical reaction that alters their structure, causing a change in color.

3. What is the irreversible change in presence of light?

The irreversible change in presence of light refers to the fact that once the photo reactive dye has been exposed to light and undergone its chemical reaction, the change in color cannot be reversed. This is because the molecules of the dye have been permanently altered.

4. What are some applications of photo reactive dye?

Photo reactive dye has a variety of applications, including in photography, printing, and textile industries. It is also used in certain types of sensors and inks.

5. Are there any safety concerns when working with photo reactive dye?

Yes, as with any chemical, it is important to handle photo reactive dye with caution and follow proper safety protocols. Some types of photo reactive dye may be harmful if ingested or inhaled, and direct contact with skin should be avoided. It is also important to properly dispose of any unused dye and follow recommended storage guidelines.

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