Naturally colored camel brown and olive green cottons are cultivated and their physical properties studied. The ash content of these cottons is higher than for J-34 white cotton, due to the presence of more heavy metals. The limited oxygen index value of naturally colored cottons is also higher than for white cotton, which makes its flammability poor. A DSC study to determine thermal behavior clearly indicates that the breakdown of white cotton into hemicellulose and cellulose and volatilization of the degradation product is complete at around 370°C, while for the brown and green cottons, devolatilization is complete at around 390°C.
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