U of S | Mailing List Archive | alt-photo-process-l | Re: Yellow tents and UV (was: outdoor gum demo)

Re: Yellow tents and UV (was: outdoor gum demo)

22 Nisan 2009, Çarşamba, 9:57 pm tarihinde, Katharine Thayer yazmış:
> On Apr 22, 2009, at 11:29 AM, Paul Viapiano wrote:
>> Now, of course, if there is cloud cover then all bets are off...
>> I say this partly in jest because in my Darkroom 1 book (Lustrum
>> Press), Linda Connor (whose exhibit I've just seen at the CCP in
>> Tucson) said that sometimes she'd leave a POP print out on her back
>> porch for 3 or 4 days!
> But that's a gelatin-silver chloride process exposed with visible
> light, no?  Apples and oranges, sorry.   Of course if there's not
> much visible light, it's going to take some time to make a print that
> depends on visible light.  But the amount of visible light isn't a
> measure of UVA. I've exposed gum prints in the shade in 3 minutes,
> and no, they weren't underexposed.

If I'm not horribly mistaking, POP paper is mostly UV sensitive -> not
much different than salted paper in that respect. Any print-out process
would need high energy "light" e.g. UV, because there isn't any later
developer action that chemically amplifies the reaction...