To change white carnation-type petals to green, stand the
long-stemmed flowers in water containing a green aniline dye.
Other suitable aniline dyes may be used to achieve colored
stripes on white flowers.
Place flowers over a basin of water which contains a very small
amount of ammonia in a bell glass. The petals will usually
change. For example, many violet-colored petals will change to
green; red colors will become green, white will turn yellow and
dark carmine will turn black.
Violet-colored asters can be moistened with a very mild solution
of nitric acid. The ray florets will turn red and will also
acquire a pleasant scent.
