Re: maco papers and chemistry

["Tim Rudman" <tim.rudman@xxxxxxxxxx>]

-----Original Message-----
From: jacques verschuren <fotjver@xxxxxx>
To: Tim Rudman <tim.rudman@xxxxxxxxxx>
Date: 15 April 1999 22:30
Subject: maco papers and chemistry


>
>
>jacques verschuren schreef:
>
>> Attempting to lith print some of my images, guided by Tim Rudman's book,
>> I wanted to share this information with the list.
>>
>> I picked an infrared image, which I exposed onto Maco Expo RN 2 with the
>> Maco lith chemistry. Diluting concentrates to the suggested volumes (2
>> part A, 1 part B and 5 parts water to make one liter (One part =125 cc))
>> I started printing and was very surprised to have a finished print
>> within minutes (approx. 10 minutes for a fully developed lith print:
>> full blacks and detailed highlights). The colour of the print was
>> comparable to the colour of an ordinary b+w RC print, except that the
>> blacks were lithblacks with no detail as in ordinary b+w printing. Even
>> printing 4 prints of the same size (30x40 cm) made no significant
>> difference as to developing times or snatchpoint. i then tried Kentmere
>> Art Classic and this too developed real fast, but with no significant
>> colour shift, as would be obtained using Kodalith Super RT. I finally
>> decided to use the Maco Expo RN in Kodalith Super RT that I had been
>> using for the same negative with Kentmere paper (reasonably fresh
>> developer, only one print (30x40 cm) had been made with this). When the
>> Maco chemistry took in between 5 and 10 minutes to get a reasonable
>> lihprint, the Kodak chemistry took 1 hour for a comparable fully
>> developed print; chemical fogging had occured, but i had "the same"
>> developed highlights as I had with the Maco chemistry (and of course the
>> Maco paper) (same exposure time as well).
>>
>> My question now is: would diluting the original Maco chemistry (2+1+6
>> see above) enable me to obtain "the same" lithprint, but developing not
>> so fast in order to achieve more control over the print. If so, what
>> dilution would be advisable?
----------------------------------

I don't really know what you are doing wrong without seeing your prints -
but I have been conducting a lith printing workshop the last few days and
nobody encountered these problems.
I would suggest diluting X 3  for starters, and maybe you are pulling your
prints too late? Try an earlier snatch point.
Maco Expo lith prints really quite easily and behaves rather like the
original (pre pepper fogging days) Sterling Lith paper, with no 'P.F.' -
slightly pinker browns and good cold rich blacks.

Tim Rudman
----------------------------------

>>
>> For those members in The Netherlands: recently Maco products have been
>> distributed by Photics International in Roosendaal (phone: 0165-529529).
>>
>> Jacques Verschuren
>
>



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