Tesaurus d'Art i Arquitectura Getty Institute 0000-00-00 2024-01-24 15:40:44 en sap green300013445bladder greengreen, sapsucusverd vessie An obsolete lake pigment made by adding an alkali (soda or lime) to the purple red juice of ripe buckthorn berries, creating a dark, yellowish green colorant that was then mixed with alum and gum to form a thick syrup that was placed in pig bladders, hence received the name bladder green. Sap green was used in watercolor paints in the 17th and 18th centuries. The primary colorants may be kaempferol, rhamnetin, or quercetin, depending upon the variety of buckberry used. verd bufeta verde vejiga 2026-03-30 20:57:57