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- Title
Coloring bamboo slivers with natural dyes.
- Authors
Dhamodaran, T. K.; Johney, Jomy M.
- Abstract
Value-addition of bamboo slivers by coloring using natural dyes for handicrafts, mat weaving and basketry work fetches improved income to traditional bamboo workers. Even though many natural dyes are available, lack of information on a standard treatment practice or schedule that can be followed is a bottleneck for the wide application of these dyes for coloring bamboo slivers. A study on this aspect revealed that dyeing in 5% weight/weight basis aqueous dye solution for three hours in boiling condition followed by the required post-treatment with 2% aqueous boiling metallic salt mordants (copper sulphate, potassium dichromate or ferrous sulphate, as the case may be) for an hour is found to be effective practice that needs to be followed for imparting satisfactory color and shades to bamboo slivers. The color development depends on the chemical nature of the dye and the mordants. Some natural dyes yield colors by direct dyeing and do not require any mordanting whereas some other dyes impart a different color after mordanting. Heartwood powder of the locally available plants such as Acacia catechu (cutch) and Caesalpinia sappan are found to be good dyes that can be used singly or with mordant post-treatments yielding different color and shades. Fruit powder of Terminalia chebula (myrobalan) yields a brownish yellow color before merdanting and a very dark gray color after mordanting in ferrous sulphate. Seed pulp of Bixa orellana, leaf powder of Camellia thea (commercial tea powder), rhizome powder of Curcuma longa (commercial turmeric powder), leaf pulp of Lawsonia alba and heartwood powder of Pterocarpus santalinus are found to offer color directly without mordanting. There was no special advantage in using metal salts post-treatment (mordanting) as far as the color development is concerned while using these dye sources. Lawsonia alba is found capable to impart a reddish gray color even at ambient temperature. The color developed is also characterized in comparison with a standard color assessment system.
- Subjects
BAMBOO; BASKET making; EMPLOYEES; RESEARCH; DYES &; dyeing; MORDANTS; POTASSIUM dichromate; TEMPERATURE
- Publication
Bamboo Science & Culture, 2007, Vol 20, Issue 1, p7
- ISSN
1535-7635
- Publication type
Article