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Cocoons are thrown into vats of boiling water rather than allowed to open naturally so that they will lose their sericin, a natural glue.

Structurally, silk is a twin thread of the protein fibroin, coated by a sticky layer formed of sericin: a protein that among other things resists oxidation, is anti-bacterial and is UV-resistant.

Then the cocoons are put into a hot bath to wash the silk fibres clean of the gluey glycoprotein sericin, before being processed to dissolve and purify the fibroin protein.

Sericin is the main sun protectant in the soap.

Raw silk consists of the true silk fibre known as fibroin and a gummy coating, sericin, which dulls the lustre of the silk unless removed.