Hi Karin
this 2007 publication might be useful

http://www.treesearch.fs.fed.us/pubs/30670

Luba

Luba Dovgan Nurse
textile conservator
Denmark

On Thursday, 31 January 2013, Karin von Lerber wrote:

> Dear Colleagues,
> connected to the wallcovering just described, I wonder if any of you might
> know literature about ageing of jute.
> The textile concerned has a very peculiar "problem". With the exception of
> one covered area it has turned reddish. At first glance, I interpreted this
> as ageing. But as the color is exactly even over all surfaces, disregarding
> if the textile is in a very dark corridor or next to a brightly lit huge
> window. Therefore I think, that the color has nothing to do with light.
> One hypothesys we are following (with analysis for dyes and pigments) is,
> that the textile was already "new fashion" and was considered too light for
> the (slightly retarded) Swiss taste. Maybe the walls have therefore be
> painted / stained with a red color.
> I would like to balance the dye / pigment analysis with detailed knowledge
> about aging and changes in jute. Unfortunately I cannot find anything
> really substantial. Is there some kind of "dark aging" for jute which would
> lead to a red (and definitely not a yellow/brown) tint?
> The corridors are not heated, the house is heated moderately. Therefore it
> would not be extremely dry in winter, not does it seem to be very humid in
> summer: there are no signs of elevated humidity. The stainig visible on
> some of the images stem from fire-fighting water in 1990.
> I also exclude the heat durin this fire (roof), because of the extremely
> even tint. There are no signs of different thermal areas as would be seen
> in case of a fire damage. And it is not soot.
>
> I am curious, if any of you know more about jute.
>
> Sincerely,
> Karin
>
>
>
>
>
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