Quote Originally Posted by Newt_on_Swings View Post
Ebay listing 310090916291

About $30 shipped for 1 oz.
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.