Wool Dyeing with Bromocresol Green for Halochromic Textile Sensors
Vol. 59, No. 2, pp. 109-115,
Apr. 2022
10.12772/TSE.2022.59.109
PDF
Abstract
Recently, the safety of workers in industries has emerged as an important issue.
In particular, when the workers are exposed to gaseous or liquid acids, it can lead to a serious
problem to the human body. In the previous studies, we investigated the application
of halochromic dyes on a nylon fabric for an acid-detecting textile chemosensor. In this
study, bromocresol green was selected as a pH-indicating dye and its dyeing, fastness, and
acid-sensing properties on a wool woven fabric were investigated. Bromocresol green in an
aqueous solution of pH 2-4 showed maximum absorption at 444 nm with yellow color,
whereas the maximum absorption changed to 616 nm showing blue color in a solution of
pH 6 and over. Color yields (K/S) of bromocresol green on wool were dependent on the
dyebath pH. The wool fabric showed greenish blue color when dyed at pH 4-7. The color of
wool dyed at pH 3 was yellowish green, and the color at pH 2 was olive. The percent
exhaustion of bromocresol green on wool increased with decreasing the dyebath pH, and
a high exhaustion value of 98-99% could be obtained at pH 2-4. When the control sample,
dyed at pH 4, was immersed in a solution of pH 3.5-4, its original greenish blue color was
maintained. When immersed in a solution of pH 2-3, the color changed into olive with
exhibiting a big color difference. The soaping process did not affect the color fastness. The
wash and dry cleaning fastness of the wool fabric dyed at pH 3-5 was very good. The dry
and wet rubbing fastness were excellent.
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