The amateur is recommended to get some experience in making
exposures before attempting to develop.
By taking plates to some photographic establishment for development,
and observing carefully the method of manipulating them, one will
soon learn about the proper exposure to allow; and then the advice
of the operator may be of some value.
There may, however, be some who are so situated as to be unable to
avail themselves of such an opportunity, and are compelled to rely
on printed instructions for all they have to do. To such we have
only to say, [p168]