Re: Temperaprint

 David,
We have a saying there is many a slip between the cup and lip. in saying
this my recomendation of --:

> 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 13:49:04 2004