U of S | Mailing List Archive | alt-photo-process-l | Re: outdoor gum demo

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.
>> ...