Abstract:
TIle technology introduced here is related to a
special process in which chalkboards are coated with
oil-mixed paint in the course of manufacture contrary
to the prior art, whereas in schools and offices, most of
the chalkboards are currently coated with gelatinemixed
paint.
However, such a chalkboard is very susceptible to
moisture, and when its surface is moistened, it is
discolored or deteriorated, and to make the matter
worse, the chalkboard is weak in durability and short
in service life to the extent of causing cracks on the
surface if touched by other objects, because the coated
surface is not substantial enough.