[Alt-photo] Re: casein on glass

[Guido Ceuppens]

Very interesting work!
If I want transparent acrylic colors with casein (I think you may want that
for back-lit photographs on glass) I use Winsor&Newton Galeria acrylic
paints :
C = (Cyan) Winsor Blue PB15
M = (Magenta) Crimson PR170
Y = (Yellow) Transparent yellow PY150
These are all single-pigment colors and reasonably transparent.
Guido
www.guidoceuppens.be



2013/6/7 Matti Koskinen <mjkoskin at gmail.com>

> On 7.6.2013 4:56, Jorj Bauer wrote:
>
>> I've been long enough a consumer and not a producer, so I wrote a page of
>>> my casein method. It's on http://www.mattikoskinenphoto.**com/casein<http://www.mattikoskinenphoto.com/casein>
>>>
>> Looks like you're off to a great start! I'm glad to see someone else
>> performing this process. My prints are really striking when backlit, and I
>> bet yours are too.
>>
> Yep, in summer of 2011 I started to experiment, tempera and casein, when I
> got dichromate. Long before that, 2002 probably a big pharmacy could order
> dichromate, but when I asked them, they said it's not available any longer.
> But my cyano-chemical supplier hopeavedos.fi had dichromate luckily, so I
> ordered a small amount. And making a small bottle of saturated solution,
> doesn't need much of dichromate.
>
>
>> I might recommend that you register your negatives to the edges of the
>> glass, since you noticed problems with the registration. And I'd also
>> recommend that you try printing on both the front and back of the pane of
>> glass, rather than double-printing on one side. If you double-print, you
>> wind up washing away some of the detail of the first print when you brush
>> on the second coat of casein (creating a higher-contrast layer in the
>> process). If you print on the backside of an already-printed pane of glass,
>> you can carefully wash it (I rest mine on top of two sponges supporting the
>> pane of glass in the tray) and not affect the quality of the first printing.
>>
> I tried registration using edges of the negative and the glass, but still
> there were small errors. So this made me experiment doing double coating
> and one exposure. The dmax is quite acceptable.
>
>  And a question: What are the names for CMY-colours, I think C is Prussian
>>> Blue, but M and Y? I'm using acrylic paints.
>>>
>> I use Schmincke pigments:
>>
>>    C: helio cerulean
>>    M: permanent carmine
>>    Y: translucent yellow
>>
>> I've also used cadmium yellow (when I want the day-glow look), or pthalo
>> blue (for a more glow-y cyan).
>>
>> And occasionally I use W&N's permanent carmine (when it's cheaper than
>> Schmincke's at the local art store).
>>
>> -- Jorj
>>
>>  thanks, the world of colour is the next thing to try.
>
> -matti
>
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