Results and discussion
Color strength of extracted dye liquors
Optimum pH was selected based on the relative color
strength value of the extracted dye liquor at which
maximum color was extracted. Changes in color
strength were found due to changes in pH as shown in
Table 1.
It can be seen from the extraction results that the
extracted solution showed maximum color strength at
pH 10 which was 108.5. It was also found that from the
neutral condition (pH 7), relative color strength values
gradually decreased up to pH 4 and then increased
at pH 3. The reason of extracting more coloring