put anything in the water in pieplateNo.4.Open one of the black envelopes
and remove the gelatin-filmed plate. Place it, gelatin side up, on a paper towel
directly under the flashlight. Cover the gelatin plate with one of the stencils.
Light the flashlight and watch the clock for 2 minutes. Do not touch or move
the plate during these 2 minutes. At the end of this time put out the flashlight
and remove the stencil. Place the gelatin-filmed plate in pie plateNo.1,which
contains the developing solution. Be surethatthe solution covers the glass plate
completely. Leave the plate in thesolutionfor 2 minutes. Remove it and rinse
itin pie plateNo.2,then quickly put it into pie plateNo.3,which contains the
fixative. After 2 minutes rinse it in pie plateNo.4,and finally stand it on edge
on the paper towels to dry. Use the book ends tosupportit.

/,II\'

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Repeat thisprocedurewith each of thephotographicplates. You may findthat

varying time intervals and different thicknesses of the gelatin coating produce

more or less successful results. You will want to experiment a bit until you find

the best time exposure for the plates you have made.

Results:When you covered the gelatin-coated surfaces of thephotographic

plates with the black paper stencils and exposed them to the light from the

flashlight, the areas of gelatin not covered by blackpaperbecame black them-

selves.Thiswas because of the effect of light on the silver bromide in the

gelatinous coating.Itseparatedthe silver from the silverbromide;the dark

areasthatappearedconsisted of puredarksilver, which is insoluble. When you

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