Winter Changed To Spring
Take a print that represents winter, and colour those parts which
should appear green, with the second green invisible ink, described in
page 25; observing, of course, the usual rules of perspective, by
making the near parts deeper in colour than the others. The other
objects must be painted in their natural colours. Then put the print
into a frame with a glass, and cover the back with a paper that is
pasted only at its extremities.
When this print is exposed to a moderate fire, or the warm sun, the
foliage, which appeared covered with snow, will change to a pleasing
green; and if a yellow tint be thrown on the lighter parts before the
invisible ink is drawn over it, this green will be of different
shades. When it is exposed to the cold, it will again resume its first
appearance of winter.
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