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“It’s a sling shot effect,” said Mats Carlsson, a professor of astrophysics at the University of Oslo in Norway, and co-author of the paper.

She was completing a corner of the under-dress, and she showed him how, to gain the desired shot effect, she had twisted together half-threads of green and blue.

Or the fibre may be purposely dyed in two different colours in some cases to give the "shot" effect.

Formerly it was usually woven with the wool and silk yarns already dyed, especially when a "shot" effect was to be produced, this being done by a twill weave of the fabric and by the use of yarns of two very different colours in the case of "shot" fabrics.

The silk dyes a pale pink while the general effect is that of a fine fawn brown with a reddish shot effect.