Re: Temperaprint

Oops I must apologise to the list pressed the wrong button lets try again

 David,
 We have a saying there is many a slip between the cup and lip. in saying
 this my recomendation of --
 
>
>> Make up a mixture of one part of pigment to six parts egg-tempera STEM (1+6)
>> coat this onto your Yupo substrate.
>>

Works for the majority of colours but Phalocyanine Blue PB15 would need to
be diluted to 1 to 12/15 of STEM. At this dilution it is working as a pure
egg emulsion I often use this colorant 1 to 10 for testing purposes
 
 
 
>> David,
>>
>> Great an Egg-tempera-print question at last. the process like all
>> dichromated colloid systems has its own little personal problems.
>>
>>
>>
>> After exposure, when I'm developing the
>>> picture, I keep rubbing off the emulsion. I usually just end up with a white
>>> box where my negative was. I've been rubbing very gently, to the point that
>>> I'm barely touching the paper
>>
>> This maybe an indicator that exposure is your problem. Around your white box
>> do you have exposed egg emulsion.This would seem to indicate that you just
>> have not given enough exposure.
>>
>> What kind of negatives are you using contone, lith, paper, inkjet,
>> imagesetter.
>> Each will give differing times due to the differing light absorption of
>> the base.
>>
>> To get you into the ballpark (where have I heard that expression before ?)
>> so to speak.
>>
>> Make up a mixture of one part of pigment to six parts egg-tempera STEM (1+6)
>> coat this onto your Yupo substrate.
>>
>> Use a foam roller make sure your coat is as smooth and thin as possible.
>>
>> Expose in direct sunlight the exposure will be in the order of one to three
>> minutes for lith, and imagesetter negs however some inkjet, contone or paper
>> negs will need more.
>>
>> Wash/develope also using a foam roller in a flat bottom dish containing
>> clean water with a small squirt of washing up liquid.Roll gently and you
>> will see
>> the unexposed egg dissolve out of the image dont be in a hurry !.
>>
>>
>>
>> I've tried various brushes from course to
>>> super soft to no avail.
>>
>> Don't use brushes until you are firmly in control of the process then they
>> can be very useful when using creative scumbling technique.
>>
>>
>> Is there a difference in using Amm or Pot. Dichromates other than
>>> printing speed or the like? I only ask as I can get the Pot. Dich. locally
>>> so that's simply for convenience.
>>
>> Yes there is a four to six times difference in exposure speed. I have found
>> the Amm Dichromate works fine for my process and it is that much faster.
>>
>>
>>
>> I thought maybe there was a problem with the eggs I was using,
>>> but I've gone so far as to drive out to the "country" and buy freshly laid
>>> eggs and still have the same problem.
>>
>> It is not the eggs I once did some research on eggs and found that they are
>> remarkably consistent around the world
>>
>>
>> Also, how fast does the egg colloid go
>>> bad and lose effectiveness? I only ask as I print in the morning and
>>> evening (before and after work) and was wondering if say, 12 hours would be
>>> too long to keep it?
>>
>>
>> Yes 12 hours is far to long the process is similar to gum in that it also
>> suffers from Dark/continuing reaction this means it slowly fogs and becomes
>> turgid in time I do not use my basic (STEM standard emulsion) after three
>> hours it gets thrown away
>>
>>
>>
>> I'd move on to something else. Problem is, I love the look of this
>>> process, even more than gum and figured I'd ask for some assistance before I
>>> continue any further.
>>
>>
>> David,
>>
>> Don't you dare remember it is always the darkest before before the dawn.
>>
>>
>> Please get back to me if you need any more assistance
>>
>> Happy egg-tempera-print
>>
>> Pete
>>
>> http://www.alternativephotography.com/peter_fredrick.html
>> http://www.books.i12.com/parlour/index.html
>> http://www.books.i12.com/parlour/tempera.html
>>
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Received on Wed Jan 28 14:11:10 2004