Discussion
The residual lignin measure shows
Answer: C
The residual lignin is measured by the Kappa number.
In paper making, the Kappa number of a pulp is the volume of potassium permanganate solution consumed by a gram of pulp under set conditions. It indicates how much lignin is left after cooking and so how much bleaching the pulp will need.
Sulphidity and active alkali describe the strength and composition of the cooking liquor in the kraft process, not the pulp. Rigidity is a mechanical property.
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