Cotton, the most important natural fiber, is the purest
form of cellulose found in nature. The content of
cellulose in cotton is about 91% and increases to 95%
after removing the natural impurities. The remaining
5% consists of other materials such as protein, pectin,
ash and minerals [1]. The microstructure of
crystalline cotton is defined as cellulose I, consisting
of about 70% crystalline and 30% amorphous
regions. The hydrophilic nature of cotton makes it
possible to dye it with different classes of dyes [2].
Direct dyes, also called substantive dyes, can be
applied to cotton fibers easily. These dyes are less
expensive than others and are suitable for cellulosic