Thou shalt not underestimate the importance of blackening and shielding the insides of your tube. I believe the closest we have to this new material is Krylon Ultraflat Black... http://www.newscientist.com/news/news.jsp?id=ns99993356 Jack Jones -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.