How can one differentiate between silk and cotton fibres by considering their burning properties?
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cotton : Ignites on contact with flames; burns quickly and leaves a yellowish
to orange afterglow when put out. Does not melt. It has the odor of burning
paper, leaves, or wood. The residue is a fine, feathery, gray ash.
Silk: Burns slowly, but does not melt. It shrinks from the flame. It has the
odor of charred meat (some say like burned hair). The residue is a black,
hollow irregular bead that can be easily to a gritty, grayish-black ash powder.
It is self-extinguishing, i.e., it burns itself out.
Explanation:
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