Reviewing some information on dyes and wanted to put this info out there. Maybe it is useful and maybe not. These items are available from Alfa Aesar (www.alfa.com)

Kryptocyanine is 1,1'-Diethyl-4,4'-carbocyanine iodide. Alfa has 1,1'-Diethyl-4,4'-carbocyanine bromide, see http://www.alfa.com/en/gp100w.pgm?dsstk=H32481 Is this the same thing, except the bromide salt and would function as an IR dye?

Also have 1,1'-Diethyl-2,2'-carbocyanine iodide (or bromide) see , is this useful as a substitute for 1,1'-Diethyl-2,2'-carbocyanine iodide, aka Pinacyanole(chloride)? See http://www.alfa.com/en/gp100w.pgm?dsstk=H31540


They also have Ethyl Red and Eosin Y.