RE: HSI loading

["Keith Davison" <keith.davison@xxxxxxxxx>]

Date sent:      	Tue, 8 Feb 2000 13:39:08 +0000
To:             	infrared@xxxxx
From:           	Clive Warren <Clive.Warren@xxxxxxxxxxxxx>
Subject:        	RE: HSI loading
Send reply to:  	infrared@xxxxx

> At 9:41 am +0000 8/2/00, Jason Revell wrote:
> 
> >Keith,
> >
> >I often load HSI with a changing bag and have not yet had any problems.  I
> >know what you mean about the moisture build-up but I have enough time to
> >load 4 sheets before it starts to cause any sort of a problem.
> >
> >A few things that might help are;
> >
> >Make sure the bag is clean before you go away.  I usualy hoover mine out
> >before I go away, and give a quick shake (when inside out) every week.
> >
> >The larger the bag the better !  Not only more space to work in but more
> >space for any moister build-up to disperse over.
> >
> >Don't use a rubber lined bag.  I have a large Jessops bag which is IR proof
> >and is not heavily lined with rubber.
> >
> >
> >Jason Revell
> >Conservation of Fine Art
> >University of Northumbria
> >
> 
> 
> Dear All,
> 
> The subject of changing bags is a lovely old chestnut.  After several
> flurries of mail on the subject the overall winner seemed to be a bag with
> a brand name of Kalt(?).  From the description of the bag, these seem to be
> the same as the current offerings from the Jessops photo store chain here
> in the UK.
> 
> Jason, your bag may be a different brand to the current bags stocked by
> Jessops. The current bags, large and small, do not have a rubberised
> interior and are IR proof.
> 
> However the bags have one critical design flaw - the seams are not
> correctly finished off, allowing the edges to fray.  This happened to me
> with two bags bought from Jessops last year.  After several instances of
> threads across 4x5 negs I took the bags back.  Jessops were very good about
> it - they replaced the wasted film and refunded the money for the
> bags....... then put the bags back on sale!
> 
> The moral of the story - before you buy a new changing bag, turn it inside
> out and inspect the seams.  If you can see the "edge" of the material then
> it will fray - reject the bag.
> 
> 
> All the best,
> 
>              Clive   http://www.cocam.co.uk
>                      Photographic Services, Filters and Equipment, Infrared FAQ
>                             http://clive.bel-epa.com
>                             Adventures in Cyberspace - Digital Art and Photos
> 
> 

Aha!
The bag I described in my original post is indeed one of the large 
Jessop bags with what appears to be a very thin rubberised lining.
Despite intensive shaking and vacuuming, I still have a problem with 
small fibres getting on my between-the-rails filters when I use the bag to 
change HIE.  This is partly why I am so reluctant to use the bag to 
change HSI darkslides.

It is not my intention to start another "my-bag-is-darker-than-your-bag" 
thread, but can anyone suggest a large IR safe non-"hairy" bag that is 
currently available from a UK supplier?

Failing this, I recently had a dream concerning an aluminium foil coated 
cardboard box, divine inspiration maybe?

Keith Davison


Neurobiology Dept.
Medical School
University of Newcastle upon Tyne
England
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