Clayton: HPR/Dourian fluorescence . . .
2005-11-14 by wwodets
Clayton- On the samples of HPR and Dourian I have, the Dourian looks slightly darker (grayer?) than the HPR under ordinary light, but the Dourian shows much more fluorescene than the HPR under black light. The fluorescense of the VFA, in turn, looks somewhat higher than the Dourian. So, I wouldn't think the HPR and Dourian are identical products physically. Visually I find them essentially identical (except for the paper color). Walt