English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

― The purpose of this study is to develop the dyeing method with dry leaves of indigo plant. Coloring matter was extracted from dry leaves of indigo plant with hot sodium h ydroxide solution. The extract was reduced with sodium dithionite, and it was used for dyeing cotton fabrics under var ious conditions. UV-visible absorption spectra of extract, reduction rate of extracts by reducing agent, and the surface c olor of dyed cotton, lightfastness were examined. For the initial 20 minutes, the absorbance of indigo solution rapidly d ecreased. However, several hours later, the decreasing rate retarded. By repeating the dyeing process, the shade looked dee per and deeper. At 30~40℃, the value of K/S reached the highest point. The concentration of indigo solution in dye bath seemed to play a critical role for the reaction of the reducing agent. It was observed that the surface color of cotton fabrics was getting bluish and its degree of value and chroma seemed slightly decreased as the K/S value was increasing. The lightfa stness was clearly enhanced by increasing the K/S value.

Dyeing Properties of Cotton Fabrics Dyed with Extract from Dry Leaf of Indigo Plant