I hope to test the Tiffen prototype on Thursday.

Leonard, please let us know how the tiffen works out.

Fwiw
 

Shot some interviews the other day with a group of firefighters. They were all wearing black t-shirts and black caps, with their station logo on them. All the clothing came out brown/purple, while the logos looked true. This was a bummer because these guys know what it should look like. Since there is no definitive cure to date, and I'm not spending $200-$500 for a filter that only kinda fixes it, I went back to informal testing. I grabbed 5 black t-shirts, a black hat, some black jockey shorts and a black bag and shot them using various PP and no PP. All but the jockey shorts showed IR contamination! Lighting was overcast daylight, manual white balance. ND made no difference. What I found was that the BBC Film PP showed the least contamination (IR still there, but in a pinch it's better than nothing). You can find it on the forum.