Ultraviolet Photograph of Crossed Hands
Quoting from comments by Ray
Rogers:
Bands of slightly
different color can be seen in Shroud photographs. They are most
visible in ultraviolet-fluorescence photographs [see picture
above]. Both warp and weft yarns show this property. Some areas
show darker warp yarns and some show darker weft yarns. In some
places bands of darker color cross. In other places bands of
lighter color cross. The effect is somewhat like a plaid.
All of the bleaching processes used through history
remove lignin and most associated flax impurities (e.g., flax wax
and hemicelluloses). The more quantitative the bleaching process
the whiter the product. The bands of different color on the Shroud
are the end result of different amounts of impurities left from
the bleaching process.
Anna Maria Donadoni, a
curator at the Museum of Egyptology in Turin, pointed out
locations where batches of yarn ended in the weave and new yarn
had been inserted in order to continue weaving. The yarn ends were
laid side by side, and the weave was compressed with the comb. The
ends are often visible, and the overlaps correspond to zones of
different color in the weave. The different batches of yarn show
different colors.
See:
Ray Rogers' FAQ
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