Operation Manual

138 Colour, Fills, and Transparency
Transparencies work rather like fills that use "disappearing ink" instead
of colour. The more transparency in a particular spot, the more
"disappearing" takes place there, and the more the object(s) underneath
show through. Just as a gradient fill can vary from light to dark, a
transparency can vary from more to less, i.e. from clear to opaque, as in
the illustration:
(A) Linear Transparency, (B) Path, (C) Effect on Object
Transparency types available in the Transparency tab are as follows:
Solid transparency distributes the transparency uniformly.
Gradient transparencies include linear, elliptical, and conical
effects, ranging from clear to opaque.