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Engineering Aid 3 - Beginning Structural engineering guide book | Next
Chapter 4 Drafting: Geometric Construction |
image than the original, particularly when the
of the light rays. Sheet and roll sizes are similar
original is in pencil. Sepia has a rich, mahogany
to those of the standard paper. You can make
image color that blocks the ultraviolet light rays.
corrections on the sepia prints by using a
Base materials may be a vellum base treated with
solution of intermediate corrector to remove the
a plastic transparentizer that allows the passage
image, then adding the pencil or ink correction.
3-51
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