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Neocyanine

Maybe a tattoo shop has some for little money it's used for some tattoo inks.
 
I looked at some places where I have bought special chems and the stuff is frightfully expensive. Fischer Scientific wants $285 for 100g.
 
Neocyanine is an IR sensitizer i thought there might be some emulsion making going on here. I'm almost out of IR film.
 
Newt_on_Swings said:
Ebay listing 310090916291

About $30 shipped for 1 oz.
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If the OP is looking for a negative retouching dye, that should work. If the OP is looking for an infrared sensitizing dye for film, the crocein scarlet probably won't.

There are several cyanine derivatives that can be used. I don't have the link anymore, but somewhere in this emulsion making subforum, PE posted a page from an old Eastman Organic Chemicals list that had the common names and chemical names of some infrared sensitizers. A couple of these are being sold by Chemsavers (on the web) by their chemical names.
 
OK, I found PE's list here:

(there was a url link here which no longer exists)

Anyway, chemsavers still has a couple of the carbo-cyanines listed above.
 
Lab Depot, Science Lab and Colonial Scientific sell a number of those dyes as well. Chemsavers selection has been limited lately.

The CROCEIN SCARLET dye structure does not look like a sensitizing dye at all.
 
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Looking for some for possible emulsion making, as well as re-sensitizing x-ray film to hopefully give it some infrared sensitivity. I have heard that this may be possible, so I'd like to give it a try. I too, am almost out of IR film.
 
Maybe a tattoo shop has some for little money it's used for some tattoo inks.
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This stuff? Dead Link Removed

Can't see how it would work... could it?
 
I'd have serious doubts that tattoo ink, even if called neocyanine would work as a sensitizer. Most "inks" are pigment-based rather than dyes, and there is the issue of what else is in the ink. Then again, it's cheap enough to try
 
Hexavalent my advice with tattoo shops was more along the line of since they sell pre made neocyanine ink they might sell pure neocyanine for the do it (mix it) yourself tattooist.

I found a UK source that sells dyes for laser applications Dead Link Removed (E7730) exact product page Dead Link Removed
1g is 82 pounds.
 
I've seen many of those laser dyes listed through other sources that won't sell to individuals. Many of them structurally appear that they would work, at least good enough to get an opinion from PE or someone that has more expertise than I do.
 
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Just a word of caution. IR sensitizing dyes are notoriously bad for keeping. So, make sure that you store it cold or frozen until use, then dissolve it in the solvent of choice and use it. The film, like most IR films is going to be a poor keeper too.

Now, this is relative to conventional dyes and films. They wont go bad over night.

PE
 
Normal usage is about 25 - 100 mg per mole of Silver metal as analyzed in a coating. However, sensitizing by bathing a coating in the dye solution? All bets are off. Just remember that all dyes are desensitizers if used in excess and you can lose quite a bit of speed if not all of it by making a tiny error.

PE
 
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What about phthalocyanine dye? It's an IR sensitive dye used in the manufacture of CD-Rs.
 
Generically, phthalocyanines are sensitizing dyes, but their effectiveness just as with other dyes must be determined by some means such as actually doing the experiment.

PE
 
Thanks, PE. I think I'd be better off actually making an IR emulsion from scratch. Could one sensitize an emulsion with just one dye such as phthalocyanine or neocyanine?
 
I wouldn't use hat perchlorate salt.

Any emulsion can be made IR sensitive, if you use the right dye. I have posted some examples here on APUG several times.

PE
 
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