FIXING, INTENSIFICATION, ETC., OF NEGATIVE. 83 
white light has been excluded from it; but if 
there is ight enough in this room to affect the 
plate in the slightest degree, it will be necessary to 
remove it from the plate-holder and commence the 
development in a dark closet, or in a room specially 
devoted to photographic manipulations. After the 
plate has been in the developer a short time, it is 
no longer injured by a small amount of light, and 
the operations of fixing and intensifying may be 
conducted in a light room if desired. 
A liberal supply of water will be required for 
washing the plate after it comes from the different 
solutions used, and a running stream with free 
escape for waste-water is very desirable. <A sta- 
tionary washstand with the usual fixtures, in one 
corner of the operating-room, or in an adjoining 
closet, will answer the purpose admirably. 
If the operating-room has one window covered 
with yellow envelope-paper, as has been recom- 
mended, it will be well lighted for the photographic 
manipulations ; and if itis found that enough actinic 
light enters the room to injure the plate during 
the time occupied in removing it from the plate- 
holder and covering it with the developer, this 
part of the operation may be conducted in a 
dark closet, or in a corner of the room partitioned 
off for the purpose. 
The negative should be carefully inspected after 
the final washing, and if it pass muster, is to be 
placed aside to dry spontaneously. A convenient 
arrangement for supporting the negatives while 
drying, is to nail a strip of board to the wall of 
