Re: Gum questions - 101

Marek,

How do you clean the roller for the next print? Isn't it picking up some of
the gum mix? How do you have a dry roller a minute later when the next sheet
is on the bench?

Jack

> From: Marek Matusz <marekmatusz@hotmail.com>
> Reply-To: alt-photo-process-l@sask.usask.ca
> Date: Fri, 11 Nov 2005 15:43:29 +0000
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Gum questions - 101
>
> On the subject of coating gum.
> I spread gum mixture with a brush and then use a dry foam roller to smooth
> the coat.I roll in one direction only applaying little pressure. You have to
> time it just so to get a nice coat. It is easy with a bit of practice.
> Marek,
> Houston TX
>
>
>> From: Don Bryant <dstevenbryant@mindspring.com>
>> Reply-To: alt-photo-process-l@sask.usask.ca
>> To: alt-photo-process-l@sask.usask.ca
>> Subject: Gum questions - 101
>> Date: Thu, 10 Nov 2005 22:17:15 -0500
>>
>> Since gum seems to be the topic of the evening I have a some questions for
>> our gum nation.
>>
>> 1) My brushes seem to have a dichromate stain built up. What is the proper
>> way to clean these? I'm guessing a soak in potassium metibisulfite,
>> followed
>> by a clean water rinse, then perhaps a short bath in an ammonia solution to
>> dissolve any residual gum, followed once again by a water rinse then a
>> final
>> rinse in hair conditioner.
>>
>> 2) I know that sodium dichromate is rarely mentioned for use because of its
>> hydroscopic tendency, but compared to potassium dichromate or ammonium
>> dichromate would it printer faster or slower have a lower or greater
>> contrast than the other two dichromates?
>>
>> 3) Since many gum printers recommend a weak bath of potassium metibisulfite
>> (1 to 2%), what is an effective and safe way to wash prints after the
>> clearing bath? Should the print then have a treatment in sodium carbonate
>> to
>> neutralize the acidic pH of the paper? Would the sodium carbonate weaken or
>> soften the gum?
>>
>> 4) I've read here and there that some printers use a micro fiber roller to
>> coat their paper. In my experience this simply results in a coating with a
>> lot of bubbles. Any hints about how to coat with this type of roller?
>>
>> Thanks,
>>
>> Don Bryant
>>
>>
>>
>>
>
>
>
>
Received on Fri Nov 11 10:30:43 2005