Oddy tests of unbleached cotton calico

I have recently done a series of Oddy tests on a variety of proposed
display materials.  While at it, we decided to test the unbleached
cotton sheeting we use for storage covers and mounts.  Of all the
tested fabrics, this one came out with the worst results, with some
white fuzziness on the lead coupon, and a slightly darker colour to
the copper coupon.  Unbleached cotton is used in museums around the
world for storage, so this surprised us.  Has anyone else Oddy
tested their unbleached cotton?  If so what were your results?  Is
this some problem with our supplier, were the other tests just so
good in comparison that they make the cotton look bad, or do I have
some contamination in my testing process?  I look forward to your
feedback.

Valerie Tomlinson
Conservator
Auckland War Memorial Museum
Tamaki Paenga Hira
The Domain
Private Bag 92018
Victoria Street West
Auckland 1142
New Zealand
+64 9 306 7070ext 7304


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                  Conservation DistList Instance 30:3
                   Distributed: Friday, June 3, 2016
                        Message Id: cdl-30-3-012
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