The Effect of Cooking Agents on the Permanence of Washi (Part II)
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_3_02_133_144.doc |
| Abstract: | CONCLUSION. Cooking using milder alkalis such as wood ash and soda ash resulted in a higher DP than cooking using caustic soda. Applying dosa, a sizing agent solution of alum and animal glue in high concentration reduced the pH and the ageing stability of kozo paper. This effect was less pronounced if the kozo was cooked using a mild alkali. Generally, milder alkalis, such as wood ash and soda ash, had a more favourable effect on the durability of papers rather than stronger alkalis, such as caustic soda and lime. Bleached fibre resulted in a most unstable paper in both strength and colour. SUMMARIES. Using durable washi (Japanese paper) contributes not only to the conservation of historic objects but also to preserving current arts and crafts. For this purpose, the durability of kozo papers made from fibre cooked in 4 papermaking chemicals, wood ash, soda ash (sodium carbonate), lime (calcium hydroxide) and caustic soda (sodium hydroxide) was compared in order to determine what makes a more durable kozo paper. Following our previous paper, which tested the untreated paper, we applied dosa, a sizing agent solution of alum and animal glue, on kozo paper samples. Cooking using milder alkalis, such as wood ash and soda ash resulted in a higher degree of polymerization of cellulose than cooking using caustic soda (stronger alkali). When dosa was applied, washi samples made with milder alkalis inhibited pH reduction and maintained their physical strength. Milder alkali, such as wood ash and soda ash, had a more favourable effect on the durability of papers rather than stronger alkali, such as caustic soda and lime. Bleached paper was most unstable in strength and colour. |
|---|---|
| ISSN: | ISSN 0034-5806 |
