这时可加入明矾以降低纸张的吸水性，否则可能产生墨渍。
Alum is added to reduce the paper's tendency to absorb liquid, which might lead to ink blots.
从而使纸张的物理强度提高、纸的吸水性和透气性降低。
Therefore could enhance the paper physical strength and reduced permeability and water absorption.
从而使纸张的物理强度提高、纸的吸水性和透气性降低。
Therefore could enhance the paper physical strength and reduced permeability and water absorption.
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