Re: The Chiba System

[Kees Brandenburg <ctb@zeelandnet.nl>]

Hi Halvor,

I have been testing the direct carbon-gelatin method and it looks  
promising. Finally zero-chrome printing is there!

Some  first observations:

- It works!
- Working with gelatin and ferric ammonium citrate shows the true  
colors of the pigments , when coating, which is very strange when  
used to gumprinting. Feels like forgetting something.
- Brush coating with hot pigmented gelatin is a lot more difficult  
then coating gum. Expirimenting with other coating methods is needed.  
Coating in a warm darkroom is easier the in a cold one.
- Even when the coatingt looks smooth to the eye the final print  
still shows brush streaks
- 'development' is fast and easy, but there is less manipulation  
possible
- unsized papers print rather well
- I had better results with 6% gelatin then with 3% gelatin, it also  
holds more pigment
- It is less light sensitive then gum. For gum my exposure times are  
between 2-4 minutes for chiba-gelatine it was 10-16 minutes. I did no  
ph => 4 correction though.
- final results look more 'gritty' then gumprints, maybe this has a  
relation with airbubbles during coating (or in the peroxide bath maybe)

I will test some more soon.


kees

PS direct dowload spots for Halvor's Chiba System are also on my site:

Low res pdf: http://polychrome.nl/file_download/3
Hi res pdf: http://polychrome.nl/file_download/4





On 23-mrt-2007, at 17:57, Halvor Bjørngård wrote:

> I have put up some web pages with my thesis. Suppose most people  
> here have
> here have found it by now, but to have formally mentioned it here :-)
>
> Had hoped to put up some more images (this study is primarily fun with
> greyscales), but no time or concentration these days...
>
> Will eventually make all those prints and convert this into  
> something a bit
> more user friendly, but for now...:
>
>
> This is two and a half printing methods based on Carbon and Gum  
> printing
> using ammonium ferric citrate as sensitizer. Main point / purpose  
> is non
> toxicity, main focus has been "make it work" :-)
>
> Follow the "The Chiba System" link on this page:
>
> http://photorelief.googlepages.com/home
>
> I will be mostly offline from end of next week, (seen fiddle with  
> the auto
> response / out of office settings) but will check mail occasionally.
>
> Thanks to the list for inspiration over the years :-)
> Halvor