Apparatus:-
A wooden frame (such as a slate or picture frame) on which is tightly stretched a piece of " unbleached " muslin.
Chemicals:-
Sulphate of iron, nitrate of bismuth, sulphate of copper, prussiate of potash. Dissolve a small quantity of each of the chemicals in warm water. The first three named are your painting solutions, the last your " developer," as it were. Using a separate brush for each colour, paint 0K1 the muslin some (outlined) picture or design. It is not advisable to attempt much detail. Allow each colour to dry before painting the next.
When dry all are quite invisible:-
To develop or bring out the picture all that is necessary is to spray on to the muslin a solution of prussiate of potash; the effect is hastened if the muslin is very slightly damp. When sprayed on with this chemical the sulphate of iron comes up blue, the nitrate of bismuth yellow, and the sulphate of copper brown. If the prepared frame be hung in such a manner that the developer can be sprayed on from behind without the knowledge of the audience the effect in a magical sense is much heightened. An ordinary scent spray or atomizer can be used, the sound being hidden by a little music.
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