Logwood - center (111 C)

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Uemura 05-29-2009 111.jpg

Museum number 111
Uemura number / title ; "Haze-some 25"
Folder location 2nd shelf
Sample location center (111 C)
Fiber type silk
Color dark purple (slightly reddish)
Dyestuff (Japanese common name) ログウード : Log wood
Dye (English common name) Logwood
Plant part extract of wood/ liquid
Dyestuff extraction boiled with water
Auxiliary agent in dye bath -
Mordant alum
Other auxiliary agent vinegar (small quantity)
Uemura's notes The dye bath contained vinegar and alum, along with the dye extract. For the preparation, firstly, vinegar was added, which shifted the color of the bath from red to more yellow. Secondly, alum was added, which changed the color into red. Use of vinegar prevented the precipitation of aluminum oxide lake (). The resultant color was reddish purple. The same phenomena would happen when copper would be used as mordant instead.
Uemura's date Kyoto