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 for Accidental colors
From The Collaborative International Dictionary of English v.0.48 :

  Accidental \Ac`ci*den"tal\, a. [Cf. F. accidentel, earlier
     1. Happening by chance, or unexpectedly; taking place not
        according to the usual course of things; casual;
        fortuitous; as, an accidental visit.
        [1913 Webster]
     2. Nonessential; not necessary belonging; incidental; as, are
        accidental to a play.
        [1913 Webster]
     Accidental chords (Mus.), those which contain one or more
        tones foreign to their proper harmony.
     Accidental colors (Opt.), colors depending on the
        hypersensibility of the retina of the eye for
        complementary colors. They are purely subjective
        sensations of color which often result from the
        contemplation of actually colored bodies.
     Accidental point (Persp.), the point in which a right line,
        drawn from the eye, parallel to a given right line, cuts
        the perspective plane; so called to distinguish it from
        the principal point, or point of view, where a line drawn
        from the eye perpendicular to the perspective plane meets
        this plane.
     Accidental lights (Paint.), secondary lights; effects of
        light other than ordinary daylight, such as the rays of
        the sun darting through a cloud, or between the leaves of
        trees; the effect of moonlight, candlelight, or burning
        bodies. --Fairholt.
        [1913 Webster]
     Syn: Casual; fortuitous; contingent; occasional;
     Usage: Accidental, Incidental, Casual, Fortuitous,
            Contingent. We speak of a thing as accidental when
            it falls out as by chance, and not in the regular
            course of things; as, an accidental meeting, an
            accidental advantage, etc. We call a thing incidental
            when it falls, as it were, into some regular course of
            things, but is secondary, and forms no essential part
            thereof; as, an incremental remark, an incidental
            evil, an incidental benefit. We speak of a thing as
            casual, when it falls out or happens, as it were, by
            mere chance, without being prearranged or
            premeditated; as, a casual remark or encounter; a
            casual observer. An idea of the unimportant is
            attached to what is casual. Fortuitous is applied to
            what occurs without any known cause, and in opposition
            to what has been foreseen; as, a fortuitous concourse
            of atoms. We call a thing contingent when it is such
            that, considered in itself, it may or may not happen,
            but is dependent for its existence on something else;
            as, the time of my coming will be contingent on
            intelligence yet to be received.
            [1913 Webster]

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