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 (

Kryptocyanine is 1,1'-Diethyl-4,4'-carbocyanine iodide. Alfa has 1,1'-Diethyl-4,4'-carbocyanine bromide, see 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

They also have Ethyl Red and Eosin Y.