Re: Gum preparation

Yves, look, I'm only here to tell you what works for me. This works
for me, and yes, the high humidity where I live may have something to
do with it, but not necessarily, as I'm not the only expert gum
printer who works this way. If you print a lot of gum, you get a
feel for when the paper is exactly dry enough to coat again. I do
check the registration marks each time, before I coat, to make sure
I've got it right; there's nothing particularly supernatural about it.

Katharine

On Apr 29, 2006, at 6:36 AM, Yves Gauvreau wrote:

> Katharine,
>
> like you I know I have a good eye for some things. I could in my
> prime align
> a peg to within 1/8 of an inch between two other pegs separated by
> a 100
> feets. Good, maybe but what you do is out of this world, how much
> would you
> say one can be off on a 8" x 10" print before people start noticing
> misalignment. Base on other ideas, it is said we can resolve 5
> lines per
> milimeter, Sandy King wrote the other day it could go as high as 20
> lines
> per mm, that less then 1/1000 of an inch.
>
> Find me an industry anywhere in the world that as to build parts or
> objects
> within tolerance of 1/1000 or even only 1/250 (5 l/mm) of an inch
> and there
> quality control is done by eyeball...
>
> In your favor I'll add this, some time back you said the relative
> humidity
> is pretty high and constant where you live, if it's near a 100% you
> probably
> don't have shrinking problem to begin with. This would explain away
> your
> apparent supernatural habilities.
>
> Regards
> Yves
>
>
>
>
> ----- Original Message -----
> From: "Katharine Thayer" <kthayer@pacifier.com>
> To: <alt-photo-process-l@usask.ca>
> Sent: Friday, April 28, 2006 6:52 PM
> Subject: Re: Gum preparation
>
>
>
>> I've probably said here before that I've never preshrunk paper and
>> that when I was in full production with tricolors, I could tell just
>> by the feel of the paper when it would be the right size to recoat.
>> kt
>>
>>
>> On Apr 28, 2006, at 3:43 PM, Judy Seigel wrote:
>>
>>
>>>
>>> On Fri, 28 Apr 2006, Yves Gauvreau wrote:
>>>
>>>
>>>
>>>> I notice the paper I used up to now was changing in size quite a
>>>> bit. I
>>>> simply couldn't do more then a single exposure of a 4x5 step
>>>> tablet on it,
>>>> this mean a larger negative would be a lot worst.
>>>>
>>>>
>>>
>>> Yves, any paper in any dimension no matter how well soaked or
>>> boiled or treated with incantations, will almost certainly change
>>> size if it's not at the same level of dryness (or humidity) when
>>> you coat. If the humidity is constant where you live, timing the
>>> interval between coats may suffice. Or set up some standard
>>> procedure, which should also help....
>>>
>>> Some years ago I tested 4 different papers with & without presoak
>>> and measured at various stages-- after coating, after drying, after
>>> developing, etc. The paper could expand or contract throughout the
>>> process. We only get a "set" dimension by luck, or paying attention
>>> -- or holding the paper rigid, which is another production.
>>>
>>> J.
>>>
>>>
>
>
Received on Sat Apr 29 08:37:43 2006