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I'm not seeing anything that isn't inconsistent with unbleached linen (especially when combined with the vagueries of early photography and general weathering). I have several WW1 coloured postcards (either paintings or overprinted photo collages) showing planes covered in fabric, some are a straw yellow and some are grey. Unbleached linen can vary quite a lot in colour depending on how it's been processed, I'd suspect that the beige colour referred to is probably a grey looking like the scans of bookbinding tape that was shown in the previous thread on this subject.
Have fun
Finn
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