Re: coating method

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From: Kerik (Kerik@kerik.com)
Date: 09/04/03-04:54:49 PM Z


I'm not familiar with the process Ryuji is attempting, but if the
consistency or the sensitizer is anything like gum, I'd suggest trying a
smooth foam roller. These are about 6" long and are very effective for
super-smooth gum bichromate coating. You want the white ones, which are
the smoothest. The yellow brushes failed miserably (too rough and porous)
and the black ones (smoother, but not as smooth as the white) work pretty
well. Available at home improvement or painting stores.

I've also started using the roller to smooth my gelatin sizing after first
applying it with either a glass rod or hake brush. After spreading the
sizing, I use a dry roller brush to smooth it out. You must work quickly
before the sizing starts to cool and get sticky, but done properly I've
gotten the smoothest gleatin sizing this way.

Kerik Kouklis

> ----- Original Message ----- From: "Ryuji Suzuki" <rs@silvergrain.org>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Friday, September 05, 2003 5:01 AM
> Subject: coating method
>
>
>> Hi -
>>
>> I've tried a few brushes, including Japanese hake, similar brush from
>> China (soft, thin, white bristle), and a few cheap foam brushes. So
>> far foam brushes produced the best results, but it's easy to leave
>> thinly coated areas in streaks. Is there any improvement that can be
>> made to foam brushes? (something like wrapping the tip with a cotton
>> flannel) Or is there anything better?
>
> So far the foam brushes have been the best for me, but I'm getting
> frustrated by streaking too. I've been thinking of dipping. I've tried
> swirling the emulsion on like collodion but it's too viscous even without
> the hardener.
>>
>> I coat large sheets (up to 22x30 inches) so absorbent material that
>> can hold some amount of emulsion is desirable. This is silver gelatin
>> process. I harden emulsion with glutaraldehyde just prior to coating,
>> so the emulsion is very viscous.
>>
> I'm only coating 4x5 glass at the moment so would be interested in
> hearing
> any better methos you can work out - i might try the cotton flannel as it
> seems that it's the bubbles in the foam edge that cause the streaking.
> Foam
> rollers produce lots of tiny bubbles in the emulsion so they're out.
>
> I've never thought of hardening before coating - does this prevent
> frilling
> and lifting????
>
> Kate Mahoney
>
>
>
>
>

-- 
Kerik Kouklis
www.Kerik.com

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