[pure-silver] Re: Agfa Record Rapid Needed - Urgent - Brighten paper base
- From: richard lahrson <gtripspud@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 31 May 2012 15:46:17 -0700
Hi Richard,
I recall reading that the brighteners in photo papers fail over
time. Is there any definite rate at
which this happens?
Rich
On Thu, May 31, 2012 at 10:09 AM, Richard Knoppow
<dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message ----- From: "Bob Younger" <ryounger@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Wednesday, May 30, 2012 4:53 PM
> Subject: [pure-silver] Re: Agfa Record Rapid Needed - Urgent - Brighten
> paper base
>
>
>> Eric,
>> What is Sprints OBA?
>> Thanks,
>> Bob Younger
>>
>>
>> On Wed, May 30, 2012 at 3:39 PM, Eric Neilsen Photo <
>> ej@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>>> Sprints OBA
>>
>>
>
> Unfortunately Sprint End Run Brightener will not affect the stock tint.
> This brightener, like those built-into some papers, is an agent which
> fluoresces under ultra-violet light making the paper surface appear
> brighter. Its used only on white stock and will look strange on tinted
> stock. Also, brightener works only where there is a sufficient amount of UV
> from the illuminating source. Because of this prints which look bright under
> daylight or fluorescent light may look dull under tungsten light.
> The problem with the AGFA papers under discussion is that they are coated
> using over a baryta layer which is tinted. AFAIK, there is no way to remove
> the tint from the baryta layer. I rather think the tint is from a pigment
> rather than a dye since it seems to be permanent.
> At one time a variety of stock tints were available, quite brown or
> yellow ones being popular for portraits since they suggested skin tones. For
> instance, Kodak's "Old Ivory" tint.
> Most warm-tone emulsions came on a warm-toned stock but some were put up
> on pure white stock, for instance, Kodak Illustrator's Special. Some
> manufacturers also coated neutral-tone emulsions on warm as well as neutral
> white stock. When on a warm-tone stock the neutral-tone emulsion looks warm
> toned.
> Again, AFAIK there is no way to change the stock tint from colored to
> white although sometimes you can stain the whole emulsion to get a colored
> look as is done with Tea toning.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk@xxxxxxxxxxxxx
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