Re: Gum questions - 101

Jack,
I would typically coat a dozen sheets at a time. Slight dampness to the
roller is OK. I would also wait some time after spreading the coat and
rolling yo allow the gum to dry just a bit. Rolling very wet gum is no good.
Between sheets I would roll the foam brush on dry paper towels to remove
excess gum and water. If it gets too wet I would just take another one. They
are very inexpensive and last for months if you clean them right away.
Marek

>From: Jack Brubaker <jack@jackbrubaker.com>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: Gum questions - 101
>Date: Fri, 11 Nov 2005 11:30:31 -0500
>
>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 11:42:49 2005