APPENDIX. 321 | 
After developing with iron, should the negative not be strong enough to 
print, wash well, and pour over it the following solution of citrate of silver :— 
Cinie eld See a eee .... 80 grains. 
ric acid 
Nitrate of silver. . ccs co Uae aa 6k Whig oF 0 ey etin ee i 
Water a 
se 
‘To strengthen a negative, pour from the stock bottle about half an ounce 
of citrate of silver into a small bottle, flow it over the plate, drain (the solution 
may be used several times), and redevelop with iron developer; in warm 
se this must. be done in the dark room. By this treatment the 
place. 
print without losing the middle 
negative will quickly be made strong enough to 
tints. Wash well and fix. 
FIXING SOLUTION. 
Hyposulphate of soda, saturated solution. 
PRINTING PROCESS. 
SILVER SOLUTION, 
DE OE REN eee ee 
_ never adding silver alone, : 
. s to the ounce of water, also increasing ne ene 
alcohol. This isd to ent a large bulk of solution, 
: vos ba but each had a 
4 tendency to become clouded. : 
4 e great recommendation of this process for amateurs 18; that the bath 
_ May be put aside for one month or twenty; at either time it will be ice 
_ perfectly clear and ready for use, only requiring filtering as ® — 
prudence, there being a very slight deposit in the bottom of the bottle after 
ding. : ‘ 
Float the papers from one to three minutes; it will answer for either plain 
or albumen papers. Dry perfectly, and expose to the fumes of ammonia for 
ten minutes. 
TONING. 
For the last five years I have entirely given up the use of chloride of gold 
stalli stn using instead an acid solution of gold, prepared in the 
crea nat : Having obtained e solution of metallic gold, of » Known 
Lu. ¥ 
