Vein of gypsum visible in the marl cliff, Blue Anchor, Somerset, England
Vein of gypsum visible in the marl cliff, Blue Anchor, Somerset, England

Image by Ashley Dace

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Gypsum on parchment
Gypsum on parchment

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BL, Add MS 40618, fol. 21v
BL, Add MS 40618, fol. 21v

Detail of Luke's robe, which is fringed with red mixed with gypsum

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Vein of gypsum visible in the marl cliff, Blue Anchor, Somerset, England
Vein of gypsum visible in the marl cliff, Blue Anchor, Somerset, England

Image by Ashley Dace

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