Lastly, one other (OT) thing I will post here since this thread is getting some traffic.
CHEMSAVERS on eBay has listed at this moment 250mg of 1,1′-Diethyl-4,4′-carbocyanine Iodide, otherwise known as kryptocyanine for $27 plus shipping. This is one of the sensitizing dyes on PE's list and, IIRC, is a sensitizer for the red and near infrared. Go on eBay and search on "carbocyanine."
This is why I say to watch eBay. Maybe it is available through their website as well.
I'm not going after panchromatic emulsions at this time so I'm not picking it up but thought someone else in the forum might be interested.
Now, back to the topic...