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                                        ETCHING.
                      24. GRAVERS. are employed of different
                   forms, square or lozenge.    For the .purpose of
                   the etcher, the square tools are most to be
                   recommended.
                      25. THE BURNISHER, if portions of an etching are found
to be too
                   dark, may be often very effectively employed in reducing
the depth and
                   width of lines, as well as in graduating or entirely erasing
tints or lines
                   if they are not too deep.    In many ways this instrument
may be used to
                   advantage which practice and trial of its capacity for
service will suggest.
                      26. THE SCRAPER is generally employed to cut off the
burr made
              ~>   by the turning up of the metal on the sides of lines
which are but
               .
 ~ slightly bitt~n or only dry pointed.
   2?. DRY-POINTED LINES are such as are made on the bare copper with the
etching-needles,
 without being bitten in with the acid. They are often very effectively employed
in retouching
 and finishing a work, especially in light and delicate parts.
   28. Many employ etching-points of several degrees of sharpness, so as
to produce at ono biting
 a greater variety of lines and texture, and by scoring the point lightly
or deeply into the metal,
 which is much more readily done on copper than on steel.
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