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  1. #1
    naaldvoerder's Avatar
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    Hello forum,

    Recently I have started to print on Forte Polywarmtone FB semi-matt . I really like the semimatt texture and tone of this paper and i can do Lith on it too. The drawback is that it takes ages to take tone. I arrive at times over 2 minutes at 5.6 for 30x40cm print. Does anyone of you have the same experiance with this paper?

  2. #2
    ann
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    It has a paper speed of 160 (if remembering correctly) and so it is about 3 stops slower. Check the spec sheet that came with the paper. FOrte recommends exposing changes ; as it has been some time since i have used that paper i am not a 100% sure if the additional time is 2.5 stops or 3. 2 minutes does seem a long time. What is the blub strength? I am assuming you are talking about exposure times for the print. My times are something like 40 secs for a 16 X 20 print at f 11, consender head.

    Toning time is going to depend on which toner and what diltuion ratio.
    With selenium 1:5 I am toning 5 minutes for completion.

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    A great deal of the exposure time that you are experiencing could very well be due to negative density. I am not sure if the JandC Polywarmtone paper emulsion is similar to the Forte that you mention...however I have experienced times of 4 minutes with a 200 watt bulb on my Durst 138S enlarger. In defense of the paper, the negative density was excessive, in my case.

  4. #4
    ann
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    Good point Donald, the negatives i have been printing are in the "normal contrast" range.

  5. #5
    naaldvoerder's Avatar
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    Ann

    I'm using a 100 Watt halogeen light in a diffusor (colorhead) setup. Are there stronger halogene lights?

  6. #6
    ann
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    you might want to check the specs for your enlarger. There are a wide variety of blubs available, however; they must match the specification of your enlarger.

    Am sure there is someone with more knowledge about electricity than I, but 100 watts for a color head seems small.

    A higher wattage would have a big impact on your exposure times.

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    The bulb in my 4550VCCEXLG is 250 watt halogen. However it is not as simple as simply installing a larger light bulb. The things to be considered in going to a larger bulb are:

    1. Cooling...increased wattage equates to more heat. Increased heat leads to fire considerations if proper cooling is not supplied.

    2. Power supply if your enlarger utilizes one. Most halogens used in enlargers are lower voltage lamps and consequently power supplies are responsible for supplying the proper voltage and they are sized according to wattage/amperage requirements.

    I agree with Ann's comment that a 100 watt lamp seems small.

  8. #8
    skahde's Avatar
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    Quote Originally Posted by naaldvoerder
    Ann

    I'm using a 100 Watt halogeen light in a diffusor (colorhead) setup. Are there stronger halogene lights?
    Before you start to install halogen-lamps that may be to strong for the the lamphouse as well as the power-supply: what times do you have with other papers at what magnification? Is the mixing box made for the format you are enlarging? Is the lamp the right one for your head or did someone install "just something" that fits?

    BTW: PW is a suprisingly slow paper but IMHO worth the wait.
    best

    Stefan

  9. #9
    roy
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    [quote="ann"]
    Toning time is going to depend on which toner and what diltuion

    I like this paper and find that just about averything it does is slow but we expect that because we know its speed. One reason that I do like it is because when using it for lith printing the paper, for my taste, often does not need toning due to the colours that emerge without further processing.
    Roy Groombridge.

    Cogito, ergo sum.
    (Descartes)

  10. #10
    naaldvoerder's Avatar
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    Stefan,

    The mixingbox is for 6x6. I have the 35mm also but i did not bother to change it. Never felt the need with other papers. I'll try and see if that brings in more light.

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