Get a glass-blower to make an ordinary shaped wine-bottle of very thin
and clear glass, and clean it well. Next take the white of two eggs
and add to it 29 grains of ammonium chloride dissolved in 1 drachm of
spirits of wine, and one-half ounce of water. Beat this mixture into a
thick froth and then allow it to stand and settle. Filter through a
tuft of cotton-wool, and pour into the specially made bottle. By
twisting the bottle round, an even layer of the solution will deposit
itself on the sides. Pour off the remaining solution, allow the film
in the bottle to dry, and again repeat the operation.
The next operation is to sensitize the film with a solution of nitrate
of silver, 40 grains to 1 ounce of water. Pour this in and turn the
bottle round for a few minutes, then pour off the superfluous solution
and again dry. Hold the neck of the bottle for a few seconds over
another bottle containing ammonia, so as to allow the fumes to enter
it. Printing is the next operation; this is accomplished by tying a
film negative round the bottle, and covering up all the other parts
from the light. Print very deeply, keeping the bottle turning round
all the time. Toning, fixing, and washing can be done in the ordinary
way by filling the bottle up with the different solutions. The effect
is very curious, and can be improved by coating the inside of the
bottle with white enamel.