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  1. #1

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    Dmax measurements of several papers.

    I have measured dmax on several papers that I have used frequently. For those who are unfamiliar dmax is the reflective density measurement of the deepest black that a paper will achieve. Higher numbers indicate a deeper black.

    Oriental VCFB 2.14

    Oriental (Grade 2) 2.10

    Azo (Grade 2 and 3) 2.07 and 2.09

    Kentmere Fineprint VC 1.97

    J and C Polywarmtone Classic VC 2.04

    All of these are excellent papers. Today was my first experience with the Kentmere paper. It appears to have a more abrupt toe as it separates high values very nicely.

  2. #2
    George Papantoniou's Avatar
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    I guess that J&C polywarmtone is made by Forte, huh ? I cannot find the J&C products here, but Forte is easier to lay my hands on...

  3. #3

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    Good stuff Donald. Would the dmax change very much when toning in selenium?

  4. #4

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    Quote Originally Posted by JHannon
    Good stuff Donald. Would the dmax change very much when toning in selenium?
    John,

    All measurements were made on the basis of selenium toned tests. All papers were developed in the same developer. This makes this a valid apples to apples comparison.

  5. #5
    mikepry's Avatar
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    Don,
    Can we safely apply the moniker "Azo Schmazo" then?
    "EVERY film and paper is good .......... for something"
    Phil Davis

  6. #6
    David A. Goldfarb's Avatar
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    What was the developer, out of curiosity?

  7. #7

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    Quote Originally Posted by David A. Goldfarb
    What was the developer, out of curiosity?
    The developer in this case was Zone VI diluted 1-3. I used it since I had fresh stock already prepared.

  8. #8

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    Quote Originally Posted by mikepry
    Don,
    Can we safely apply the moniker "Azo Schmazo" then?
    I am not saying anything other then that these are the dmax that my tests indicated.

  9. #9
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    The Dmax of reflection print materials is limited to about 2.2 due to the laws of physics. There are work arounds available to manufacturers that allow higher values to be achieved by putting certain addenda in the topcoat.

    The more matte the surface, in general, the lower the dmax.

    In general, the dmax and the amount of silver developed or coated have little relationship. It is the form of the silver metal that is important to image tone and density.

    PE

  10. #10
    Alex Hawley's Avatar
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    Great stuff Don and thanks. Thanks to PE too for the additional explanation.

    Since I have never done any densitomer testing, I have two questions:

    (1) what does the numerical spread in the values mean? Is it a large difference between papers or a small difference. Just at face value, it looks like a very small difference.

    (2) Are the differences between the papers detectable to the eye? Understand this is more subjective, but can the differences really be seen and how apparent are they?

    I just recently ran a comparison between Kentmere Bromide (grades 2 and 3) and Azo. No densitomer tests, but to my eyeball, the richness and depth of the deep blacks were indistinguishable.
    Semper Fi & God Bless America
    My Photography Blog

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