Hold over a lighted match, a purple columbine, or a blue larkspur, and
it will change first to pink, and then to black. The yellow of other
flowers, held as above, will continue unchanged. Thus, the purple tint
will instantly disappear from a heart’s-ease, but the yellow will
remain; and the yellow of a wall-flower will continue the same, though
the brown streak will be discharged. If a scarlet, crimson, or maroon
dahlia be tried, the colour will change to yellow; a fact known to
gardeners, who by this mode, variegate their growing dahlias.