Re: Dmax versus process?

My Lord, before this goes a step further please note that I did state
that all of the processes were for single coating and exposure. With
multiple coating you can indeed get much higher Dmax with gum. And
maybe Chris can get Dmax of 1.8 or more in gum with full tonal scale
using a digital negative.

But that is what all of the fuss about coating from the back was
about, i.e. the possibility of getting a higher Dmax with gum with
just one coating and exposure.

In my experience the only thing that poses greater danger to your
health on this list than political commentary is getting misquoted
about gum.

Sandy

>Sandy,
>
>thanks, your answer is much better then I expected. I'm surprised that you
>can't get a better Dmax from gum unless this is for a single coat of course.
>
>I always thought that density measures where dimension less??
>
>Thanks again and my best regards
>Yves
>
>PS Thanks to Loris as well.
>
>
>
>----- Original Message -----
>From: "Sandy King" <sanking@clemson.edu>
>To: <alt-photo-process-l@usask.ca>
>Sent: Monday, May 01, 2006 11:32 AM
>Subject: Re: Dmax versus process?
>
>
>> Yves,
>>
>> I don't know if there is a text on this anywhere, but my own
>> measurement of reflective Dmax of these type of prints suggests the
>> following. This has been for prints with a full range of tones from
>> the highlights to the shadows, and is for one coating and exposure.
>>
>> By process, the maximum Dmax that I have seen are.
>> 1. Silver gelatin print on glossy paper -- log. 2.2 or higher.
>> 2. Carbon prints on glossy papers -- log 2.0
>> 3. Silver gelatin print on matte paper - log 1.85
>> 4. Carbon prints on matte type surfaces - log 1.80
>> 5. Albumen -- log 1.8
>> 6. Pt./Pd. and kallitype -- log 1.55
>> 7. VDB and Argyrotype -- 1.45
>> 8. Salt Print -- 1.40
>> 9. Gum prints -- 1.20
>>
>> Again, these numbers are based on readings that I have taken of
>> actual prints, and will almost certainly differ to some extent from
>> the experience of others. Also, toning plays an important role in
>> Dmax of all types of silver prints.
>>
>> It might be interesting to gather more information on this with wider
>> sampling, but for useful results it would have to be done in standard
>> conditions and with calibrated equipment.
>>
>> Sandy
>>
>>
>>
>>
>>
>>
>>
>> >Hi,
>> >
>> >say you make several prints using the same paper, maybe a step tablet to
>> >keep it as simple as possible, what could one expect in terms print Dmax
>> >from various process like Salt prints, Kallitype, Vandyke, Argyrotype,
>> >Platinum, Palladium and pigment based process say gum and or carbon?
>> >
>> >If there is some text somewhere on this, it would be fine. I know some of
>> >you teach alt-process printing and I'm sure someone as an idea on this,
>it
>> >doesn't have to be in absolute terms.
>> >
>> >Thanks
>> >Yves
>> >
>> >PS. Please don't say try it out yourself...
Received on 05/01/06-10:07:47 AM Z