Research Initiatives Part A Fiber Identification By Burning · Cotton (natural cellulosic fiber) – burns, doesn’t melt; smells like burning paper or wood; residue is gray ash · Flax (natural cellulosic fiber) – burns, doesn’t melt; smells like burning paper or wood; residue is fine gray ash · Wool (natural protein fiber) – burns, doesn’t melt; strongly smells of burning hair or feathers; stops burning when removed from fire; residue is black hollow bead that can be crushed to black powder · Silk (natural protein fiber) – burns, doesn’t melt; smells of burning hair or feathers (odor is not as strong as wool, silk doesn’t contain sulphur); stops burning when removed from fire; residue is black hollow bead that can be crushed to black powder · Rayon (artifici...