[alt-photo] Re: Albumen, Cyano, larger printers - oh my!

[Loris Medici]

Chris, I also use Da Vinci watercolor wash brushes (red/black painted handle
w/ dark amber colored synthetic hair) when brush coating. If you pre-wet the
brush beforehand, it uses the same amnt. of sensitizer as rod coating. I
mean you won't need extra sensitizer... (I use distilled water for wetting
the brush with pt/pd, drinking water for anything else...)

See this for info and visuals about rod coating:
http://www.mikeware.co.uk/mikeware/preparations.html
(See the sub-section labeled: "Rod-Coating Paper with Sensitizer Solution".
Somebody else already mentioned that I think, I just wanted to add the
source of the information.)
BTW, you must work out the right amnt. for the coating area first; there
should be very little sensitizer remaining, which you can soak with a piece
of toilet paper / paper towel.
(See the image labeled "Blotting" on the page above...)

With 5% HCl / Fabriano Artistico: 1 minute for one side and an additional
minute for the other side (read as: drain and flip the paper halfway) is
plenty enough. 2000ml 3 - 3.5% HCl is definitely enough for 20 11x15"
sheets, and probably also enough for more. (I haven't used it past 20
sheets, but since it didn't slow perceptibly after 20 sheets, I think it's
good for more too; if my calculations are correct, this bath can neutralize
~50g CaCO3. The question is: How much CaCO3 has each quarter sheet of
Fabriano Artistico?) Transfer the papers to a large volume bath and change
the water every 5 sheet. When all are processed, wash/rinse each paper
individually and "thoroughly".

Hope this helps,
Loris.


-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
John Brewer
Sent: Friday, April 23, 2010 10:12 PM
To: 'Chris'; 'The alternative photographic processes mailing list'
Subject: [alt-photo] Re: Albumen, Cyano, larger printers - oh my!

Chris

I use a magic type brush (Da Vinci white haired thing), if brush coating.
I've never been successful with foam brushes for cyano. If rod coating I add
tween.

John.

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
Chris
Sent: 23 April 2010 19:55
To: Chris; alt-photo-process-list at lists.altphotolist.org
Subject: [alt-photo] Re: Albumen, Cyano, larger printers - oh my!

loris.medici.name wrote " Also, have you tried to apply the solution with a
brush?
I mean why do you want to use a glass rod instead of a good brush?
Both methods are easy once mastered."

I've tried a foam brush - and gotten uneven results. Based on feedback from
Francis, I believe my issue w/ the glass rod stems from trying to push it
around too much, making it too thin in parts. I like the suggestion to try
to do it 'in one pass'. I'm not, however, sure how to keep from 'dragging'
the excess off the paper, onto the glass..  

Re: acidifiction.. I plan to use the technique which I believe you
suggested, 5% HCl solution for some number of seconds ('until the bubbles
stop", was the expression,I think)

Thank you!
Chris