[pure-silver] Re: How do I increase local contrast in my shadows when printing?

Ilford #5 is different from Kodak #5+, which is different from Wratten #47b.
The latter is much denser than the former, but I don¹t know what the
difference might be and it will depend on the emulsion used. Nevertheless,
don¹t expect a huge difference. That said, Wratten #58 is a huuuge
difference over the soft filters from Kodak and Ilford. It is soft beyond
practicality.





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com







On 2005-09-19 10:02, "Peter Badcock" <peter.badcock@xxxxxxxxx> wrote:

> OK.  So I just did a bit of reading about how contrast is controlled on VC
> papers, and it is set by the ratio of blue:green light.  Magenta filter is
> red+blue (no green).  Since the paper is insensitive to red, the blue light
> component in magenta is all that is seen by the paper.  The only way I could
> see that a #47b blue filter would offer any increase in contrast is if it's
> ration of blue:green is > than the ratio of blue:green in the magenta filter.
> These wratten curves ( http://www.geocities.com/thombell/curves.html
> <http://www.geocities.com/thombell/curves.html> ) don't give an answer since
> neither #33 nor #47b show any green component.  I'd rather not buy a blue
> filter if the effect will be marginal or un-noticeable.  Maybe Ilford's #5 is
> not the same as wratten#33.
>  
> regards
> Peter
>  
> On 9/19/05, DarkroomMagic <info@xxxxxxxxxxxxxxxx> wrote:
>> Peter
>> 
>> The blue filter is Wratten #47b. You might have a #25 Red, which is part of
>> the tricolor series. The third one is #58 Green. The green filter is the
>> softest and the blue filter is the hardest you can get from your paper. They
>> are not readily available except for the red filter, but they can be ordered
>> from  all major filter manufacturers. Mine are from Tiffen.
> 


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