Re: Gum questions - 101

From: Jeremy Moore ^lt;[email protected]>
Date: 11/11/05-11:48:43 AM Z
Message-id: <4374D97B.2090107@charter.net>

Can anyone who uses a roller give me a web link that points me to the
type they are using? The first one I tried seemed to make things much,
MUCH worse than helping at all!

-jeremy moore

>>
>>
>> > 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 11:49:07 2005

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