Lac-mushi no jyushi jyo - left (305 L)

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Uemura 09-10-2009 305.jpg

Museum number 305
Uemera number / title 一; 櫨染 廿五 "Haze-some 25"
Folder location 4th shelf
Sample location left (305 L)
Fiber type wool
Color purplish pink
Dyestuff (Japanese common name) ラック虫の樹脂状 : Lac-mushi no jyushi jyo
Dye (English common name) Lac dye
Dyestuff (botanical name) resinous secretion developed by the scale insect Kerria lacca
Plant part resinous secretion / dried
Dyestuff extraction soaked in alcohol
Auxiliary agent in dye bath sodium carbonate solution ?
Mordant alum (added into dye bath)
Other auxiliary agent vinegar
Uemera's notes The dyestuff was soaked in alcohol to extract the dye compound. The extract was mixed with sodium carbonate solution ? (炭酸アルカリ水) to make a solution for dye bath, to which both vinegar and alum were also added. The dye bath was in an acidic condition, and warmed up during the dyeing. The resultant colors were slightly darker than those dyed with the commercially available pre-extracted lac dye. Similar type of dyed colors are seen with a couple of objects in the Shōsoin treasures (正倉院宝物), and the results of this experiment may suggest a possible dyestuff used for them.
Uemera's date Kyoto