Rod Smith wrote:
> In article <1191991399.957104.148210@[EMAIL PROTECTED]
>,
> sreenath <sreenathbh@[EMAIL PROTECTED]
> writes:
>> On Oct 10, 9:15 am, gr <greif1nos...@[EMAIL PROTECTED]
> wrote:
>>> I may have to do a project which uses RA4 type color paper, but want
to
>>> end up with a B&W silver image. Can I process the silver in this and
get
>>> rid of the incor****ated dye somehow?
>>> gr
>> Well, RA4 paper also has silver halides for photo sensitivity. By
>> using a normal b/w developer(Dektol, etc), it should be possible to
>> get a silver image. The dyes will not form in this case.
>>
>> But how much silver the paper has, in order to get proper density, I
>> am not sure. Just expose one RA4 paper and develop in Dektol and see.
>
> I've done it occasionally, usually as part of a reversal process (to
print
> slides on RA-4 paper, which is another topic entirely....). The result
is
> a rather faint and low-contrast image; the blackest "black" is more like
a
> middle grey. I don't know if some particular developer would create a
> blacker black. (I've used E-72 and DS-14.)
>
> I have to ask the OP why he's got those particular constraints. If you
> want a silver-halide final image, why not use a conventional B&W paper?
If
> you want a B&W (but not necessarily silver-halide) image on RA-4 paper,
> why not process it in RA-4 chemistry and find a filter pack to get a
> neutral image?
>
>> On the other hand if you want b/w image(silver image) from a color
>> negative, then you could just use paper similar to Panalure.
>
> Unfortunately, Kodak's Panalure has been discontinued for a while. You
> might still be able to find some in a store somewhere, but I have no
> specific pointers, aside from the fact that there are two Panalure
> auctions on eBay at the moment. I think I heard that Ilford's got
another
> panchromatic B&W paper, but they're marketing it for operators of
lightjet
> printers, not for conventional darkrooms. I don't know how it would
> respond to color negatives in an enlarger. Unfortunately, I don't recall
> what this paper is called.
>
> Fortunately, color negatives can be printed on conventional B&W paper,
> although the fact that most B&W papers are insensitive to red light will
> result in some oddities compared to a photo that was shot on
conventional
> B&W film. This might or might not be im****tant for any given photo.
>
I need a specific combination of surface finish and substrate that is no
longer manufactured with a B&W emulsion. Curse the manufacturers for
dropping all the black and white products!
gr
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