Presentation on theme: "WELD LAKE PREPARATION Jo Kirby and Catherine Higgitt National Gallery, London May 2005 Eu-ARTECH organic project."— Presentation transcript:
WELD LAKE PREPARATION Jo Kirby and Catherine Higgitt National Gallery, London May 2005 Eu-ARTECH organic project
Reseda luteola L. English weld French gaude Dutch wouw German Wau Italian reseda
Recipes fell into 3 broad categories 1.Extraction of dyestuff with limewater solution, then alum (+chalk) added to precipitate lake - Use Boltz von Rufach 1549 2.Aqueous extraction of dyestuff, then alum and chalk (or other Ca salt/lead white) added to precipitate lake - Use 15th C Sienese/Bolognese recipe for arzica 3.Alkali added to aqueous solution of dye (or weld boiled in alkali), then alum added to ppte - Use Dossie, 1758 as example of this type
Recipes – substrates 1.Boltz von Rufach 1549 (lime water; alum/chalk) - Ca, Al, O: Hydrated alumina/chalk/calcium sulphate 2.15 th C Sienese/Bolognese (alum/chalk) - Ca, (Al): Chalk (trace of hydrated alumina?) 3.Dossie, 1758 (alkali, alum) - Al, O: Hydrated alumina
Recipes Most of the examples of yellow lakes we encounter in paintings are pre-1800 so deliberately avoided 19 th C recipes Steps in manufacture –Extraction/boiling –Removal of plant material –Precipitation of lake –Filtration and washing of lake –Drying and grinding of products
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