[alt-photo] Re: RES: Re: One-coat temperaprint

[alex.j.chater]

Rafael

If you want a single coat I would suggest you try a colorant designed  
for air brush use. It should be quite fine and produce a better  
strength of colour without having too strong a mix. Temperaprint is  
really a multi coat system and does not do well on single coats. I  
have found that in general to get a good black will need two or three  
coats. Obviously you will need a good registration system to do this  
well.
3 Hours may not be enough and even if it did hold I suspect that the  
image will be crude. It is the thin coats that hold detail well,  
which is what you will need for the100lpi, while the heavy pigmented  
coats are better suited for bold layers that do not have detail. I  
have used successfully a small sun bed which gave exposures of 6-7  
minutes. In the UK these can be found in second hand shops or charity  
shops. Maybe not a perfect light source, being tubes, but i have had  
good results with them.

alex



On 9 Oct 2010, at 23:03, Rafael Frota wrote:

> Alex
> It´s a  great honour talk to you. Let me explain
> I´m doing some experiences with light sensitive emulsions, looking  
> for a
> cheap and easy method for "printmaking without a press".
> Temperaprint has all the qualities for this porpouse. Here in  
> Brazil we
> don’t have too much access to many features and we have to improvise.
> Everything here is expensive.
> I have 2 kinds of works: photogravures and drawings. For the  
> drawing, I use
> a scratched transparency, and for photos I use halftone screen  
> (100lpi).
> I need to print these negatives in a paper using a cheap process like
> temperaprint. But I need do it in a single coat.
> As I use "trace negatives" (hatch and dots) I don´t need tones but  
> only one
> solid and deep black.
> I use a negatoscope as UV light source. For a pale black, it´s  
> about 20 min.
> For a strong black, I didn´t get it even in 1h! When I wash the  
> paper (using
> the foam roller), the emulsion is washed away letting only a ghost.  
> The
> emulsion is too delicate to wash with the roller but too heavy to  
> use a
> spray bottle.
> So, is there any way to make a dense black? About 3h sun exposure? :))
>
> Thanx a LOT!
>
> Rafael Frota
> www.rafaelfrota.com
>
>
> -----Mensagem original-----
> De: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] Em  
> nome de
> alex.j.chater
> Enviada em: sábado, 9 de outubro de 2010 18:06
> Para: The alternative photographic processes mailing list
> Assunto: [alt-photo] Re: One-coat temperaprint
>
> hello Rafael
>
> The problem of the amount of pigment in the mixture is that as you
> load more and more in, the the coating will become heavier and have
> more contrast. Beyond 5 parts of egg mix to 1 part of pigment, the
> number of tones reduces and the detail becomes more crude.
>
> Are you using the Temperaprint on a clear base (effectively using the
> light stopping properties of the Temperaprint coating), to create a
> further image on another base with the temperaprint, or are you using
> an existing image on a clear base to print an image with the
> temperaprint
>
> If you are just laying a coat that you are going to draw into then
> the amount of pigment to the egg mix is not really an issue until
> there is not enough egg to bind the pigment together. Up to that
> point I would suggest more exposure
>
> alex
>
>
>
>
> On 9 Oct 2010, at 21:28, Rafael Frota wrote:
>
>> Hello
>>
>> As I said, I´m doing some experiences with temperaprints. I work with
>> photogravures and now I´m  trying to use temperaprints as “cliché
>> verre”
>> like this:
>>
>> http://www.spamula.net/blog/i42/schulz3.jpg
>>
>> I need a single coat with a very (or almost) deep black in to get
>> it, but
>> when I use lots of pigment, the emulsion doesn´t get hard enough.
>>
>> Any ideas?
>>
>>
>>
>> Thanx
>>
>>
>>
>> Rafael Frota
>>
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