How to judge the quality of paper

The quality of paper can be judged from the following aspects:
Observation of appearance: High quality paper has a uniform color, usually a natural and soft white or beige. The surface of the paper is flat and smooth, without wrinkles, waves, or unevenness. The fiber distribution is uniform and fine, and the resistance experienced by the pen tip during writing is small, making writing smooth.
Testing physical performance:
Thickness and weight: The larger the weight, the thicker the paper, but the appropriate thickness should be selected according to the specific application. High quality writing paper has moderate water absorption, and water droplets will not immediately penetrate and disperse, but will stay on the paper surface for a while before being slowly absorbed.
Strength and toughness: Good paper has toughness and will not be easily torn apart. After releasing it, it can basically restore its original appearance. Fold and unfold repeatedly without any cracks or damages.
Water absorption: Drop a drop of water on the surface of the paper. High quality writing paper has moderate water absorption, and the water droplets will not immediately penetrate and disperse, but will stay on the paper surface for a while before being slowly absorbed.
Other detection methods:
Soak test: Soak the tissue in water and observe its reaction. Good quality tissues will not dissolve quickly in water, maintaining a certain degree of integrity and toughness.
Burning test: Take a tissue and ignite it to observe its burning condition. Qualified tissue should burn relatively intact and not produce a large amount of ash.
Odor and Taste: Good tissues will not have a pungent odor, which can be checked by smelling them.
By using the above methods, it is possible to effectively determine the quality of paper and choose the paper that suits one's needs.