Re: PVA for gum printing

From: Dave Soemarko ^lt;[email protected]>
Date: 09/03/04-11:19:52 AM Z
Message-id: <00b201c491da$39d5d6b0$0a808080@wds>

Hi Katherine,

Could you maybe use non-glare glass?

Dave

----- Original Message -----
From: "Katharine Thayer" <kthayer@pacifier.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, September 03, 2004 6:18 AM
Subject: Re: PVA for gum printing

> Hi, long time no hear!
>
> I'm creating hardened gum (not PVA) right now for the first phase of the
> analysis; hopefully the result of that first analysis will be available
> in a couple of weeks. I'm pretty excited about it.
>
> Do you or anyone know of any reason why mylar shouldn't be used for a
> substrate for hardening the gum? The chemist I'm working with is going
> to analyze the mylar somehow to make sure there's nothing that the gum
> could pick up from it in the brief time it sits on the mylar sheet that
> could contaminate the sheet, but I'm still a little nervous about it. He
> wanted glass, but I couldn't get the gum to stick on the glass (I'm just
> finishing a post about that that I'll send in a minute) so I've settled
> on mylar as a reluctant second. The nice thing about mylar is that it is
> easier to deal with a lot of mylar sheets with gum on them than it would
> be to deal with a lot of pieces of glass with gum on them.
> Katharine Thayer
>
> Robert Schaller wrote:
> >
> > Dear Katherine,
> >
> > What ever happened to this physical chemistry research? Any
updates?
> >
> > Robert Schaller
> >
> > On 6/17/04 6:19 AM, "Katharine Thayer" <kthayer@pacifier.com> wrote:
> >
> > > I've got a physical chemist interested in working out the chemistry of
> > > dichromated gum, but because gum is so complicated and variable and
the
> > > structure isn't completely worked out, and the structure of PVA is
> > > simple, he wants to start with PVA and see if he can understand what
> > > happens there first, before considering gum.
> > >
> > > I told him that I had printed with gloy, which I believe to be mostly
> > > PVA, and it seemed to work very similarly to gum. But we need to use a
> > > pure PVA of course for these experiments, so I need to find a grade
and
> > > molecular weight of PVA that would be similar to that used in gloy. I
> > > don't know where one would find that out about the PVA in gloy, can
> > > anyone give me a clue? Or suggest a grade and molecular weight that
> > > might be close?
> > >
> > > I googled "gloy" and found some places to buy gloy in UK, but not a
> > > manufacturer. But (gloy printers should appreciate this) I did find a
> > > composer who composed "Ode to Gloy" a parody of Beethoven's 9th, "in
> > > honor of the glue."
> > > Katharine
>
>
Received on Sun Sep 5 08:23:29 2004

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