Why paper finishing
General
In general, paper is coated to increase its value.
But it can be also about a security issue or preparation of paper for its later function (For example, you could never fill milk in a bag made of newspaper).
An uncoated paper (as for example newspaper pages) is not water- or dirt-proof, is quite boring without any accentuation and is neither stable nor resilient.
For that reason:
- you get black fingers when reading a newspaper
- the picture in your newspaper do not have any shine
- paper boats sink after a certain period of time
- paper hats are not water-proof



