Gi 
- anether 
W. Crookes on the Wax-paper Photographic Process. 17 
63. No rule can be laid down for the proper time of exposure; 
it will depend upon the uality of the light, and intensity of the 
negative; some pictures ing completed in a few minutes, others 
requiring upwards of half an hour. The printing should always 
Saturated solution of hyposulphite of soda 10 ounces. 
Water ee ear ee 
This bath will be found to fix the pictures perfectly, but they 
will generally be of a reddish tint ; if it.be thought desirable to 
obtain the pictures of some shade of dark brown, or black, it 
will be necessary to employ a bath made as follows ; 
Saturated solution of hyposulphite of soda 10 ounces. 
PW ae : : ; : : : ounces, 
Exhausted positive exciting solution (61) 10 ounces. 
_ Mix these together and then add the following ; 
Water ; : ; : cee 10 ounces, 
RISER OT BONES 4-.s eey ork Te gD grains; 
taking care in mixing to pour the solution of gold into the solu- 
on of hyposulphite, and not the latter into the former, or | 
er decomposition will be produ - 
Pour this mixture into a dish, and lay the positive carefully 
on it, face downwards. As soon as it is thoroughly damp, 
_ (which may be known by its becoming 2 gd flat after having 
time, When first put in, the color will change to a light brown, 
and in the course of some time, varying from ten minutes to two 
bath for ten minutes at least in ord t it may be perfectly 
SECOND SERIES, Vou. XXIl, NO. 65.——SEPT., 1856, 
23 
