Re: Polymer Plate 80% screen Weirdness

From: pete ^lt;temperaprint@blueyonder.co.uk>
Date: 02/16/04-05:53:26 PM Z
Message-id: <BC570876.520D%temperaprint@blueyonder.co.uk>

Kate,
 My dear you you on the edge of the world we do understand.

Pete >;--<<

> Here in primitive little New Zealand we use a piece of plate glass and the
> sun......talcum still recommended tho...Kate
> ----- Original Message -----
> From: "Jon Lybrook" <jon@terabear.com>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, February 17, 2004 7:05 AM
> Subject: Re: Re: Polymer Plate 80% screen Weirdness
>
>
>> Thanks Jan.
>>
>> I just called and got a price quote of $219 for a new rubber blanket. I
>> could be well on my way to a frame vacuum that is not 40 years old for
>> that much! Something tells me I'm going to try the talc route...
>>
>> Jon
>>
>>
>> On Mon, 16 Feb 2004 jpptprnt@verizon.net wrote:
>>
>>> Jon
>>> Shake on a little bit all over, then tap the side of the plate (holding
> it
>>> vertacly) and knock most of it off. Brush the remaining baby
> powder/Talc off
>>> with a clean soft brush (hake works well). It will look like nothing is
> on the
>>> plate but it is. It does not take much.
>>>
>>> hope this helps
>>> Jan Pietrzak
>>>
>>>> From: Jon Lybrook <jon@terabear.com>
>>>> Date: 2004/02/16 Mon PM 05:09:09 GMT
>>>> To: alt-photo-process-l@sask.usask.ca
>>>> Subject: Re: Polymer Plate 80% screen Weirdness
>>>>
>>>> I think this is kind of what I'm seeing, only there are dozens of
> them,
>>>> and very small, about the diameter of a pin head and larger. I'm
> getting
>>>> a fair amount of pressure, but maybe the pad needs to be replaced.
>>>>
>>>> Don't I need pure talc, or will perfumed baby powder be okay? I'm a
>>>> little concerned about what affect fragrance and other additives might
>>>> have on the plate and/or film.... Hell, I'm a little concerned what
>>>> affect talc will have inside my frame vacuum!
>>>>
>>>> Jon
>>>>
>>>> On Mon, 16 Feb 2004 Ender100@aol.com wrote:
>>>>
>>>>> I'm not sure what it looks like‚?"dusting talc reminds me of the
> problem
>>> with
>>>>> scanning negatives where talc or mounting fluid is used to avoid
> Newton's
>>>>> rings. Here is a website showing the effect:
>>>>> http://physics.ucsd.edu/was-sdphul/labs/demos/optics/NEWTRNGS.html
>>>>>
>>>>> It does indeed look very much like a mark made by a water
> drop....this is
>>>>> probably the culprit.
>>>>>
>>>>> The Newton's Rings effect would also be exacerbated by uneven
> pressure on
>>> the
>>>>> negative/plate contact area‚?"which could be due to eneven pressure
> of the
>>>>> vacuum table membrane beneath the two.
>>>>>
>>>>> So, get out your old can of baby powder....
>>>>>
>>>>> Hope this helps.
>>>>>
>>>>> Mark Nelson
>>>>>
>>>>>
>>>>> In a message dated 2/16/04 1:59:42 AM, jon@terabear.com writes:
>>>>>
>>>>>
>>>>>> Thanks for your input Mark.¬ Not sure how the pebbling up against
> the
>>> back
>>>>>> of the plate would do anything to affect the film on top, but who
>>> knows?¬
>>>>>> I'm wondering if the pebbling on the frame vacuum hasn't somehow
>>> affected
>>>>>> the screen in areas where the two came in direct contact with one
>>> another.
>>>>>>
>>>>>> I've read on Strange Ross' site he uses a dusting of talc on the
> plate
>>> to
>>>>>> remove air bubbles.¬ I may try that and/or call Peter at Alpha
> Graphics
>>>>>> and see what he thinks.¬ I will let the list know how it goes.
>>>>>>
>>>>>> Thanks!
>>>>>> Jon
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>>
>>
>
>
>
Received on Tue Feb 17 06:54:27 2004

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