Re: outdoor gum demo
BTW, just came into my mind putting the discussion in another perspective; it's very interesting that greenish brown/brownish green/brownish stain color is pretty effective at blocking UV (visible light DR and UV DR is different) for pyro-developed silver/gelatin negatives, whereas "coincidentally" green color is the strongest UV blocker for many inksets / printers. Two most different medias (printer ink / stained gelatin) exhibiting similarities in the same context -> confusing indeed. Not that I'm interested in pursuing -> just mentioned for the records... 16 Nisan 2009, Perşembe, 10:29 am tarihinde, Loris Medici yazmış: > Oh, come on!!?? My understanding of the discussion was that yellow "ink" > is the most opaque to UV light compared to other colored "ink"s (there > wasn't named a single inkset which doesn't exhibit this - BTW, black is > another case and I won't get there...), but it is not necessarily more > opaque than combination "colors" (mostly; Mark told about R1800 where > yellow "ink" is the most opaque including combination "color"s in the > comparison...) for whatever reason (probably because there's more ink on a > given area then when printing with a single ink). And all above was given > in the context of many different inksets! > > Most importantly, being highly sensitive to sunlight, I happen to burn > more under say red, blue, white beach umbrellas compared to yellow ones -> > empirical evidence to me, bringing us to my original suggestion of a > yellow tent... > > > 16 Nisan 2009, Perşembe, 2:09 am tarihinde, Katharine Thayer yazmış: >> >> ... >> >> Forget the yellow tent. Haven't we just finished a discussion where >> we agreed (I certainly thought so) that the idea that the visible >> color of a thing is related to the UV-blocking capability is, well, >> to quote someone else's phrase, "a nonsense" ? That goes for the >> pigments used to dye material for a tent as well as for the inks in >> an inkjet printer. A tent might be useful if you don't have shade >> where you're going to be, but I wouldn't worry much about the color >> of it. >> >> ...
|