Logwood - center (111 C)
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| 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 |