128 PRACTICAL PHOTOMICROGRAPHY. 



fer" a lantern-slide, transparent positive, or "opal print." 

 After the final washing, which in the present case need not be 

 so very laborious as if no further ablution were to take place, 

 we place our transferotype print face to face with a perfectly 

 clean sheet of glass or opal, squeegee the two together, place a 

 double layer of blotting paper over the print, then a flat piece 

 of wood, then on the wood a slight weight, as one pound. 

 After about half an hour we place the support bearing the 

 print in water at about 100 deg. Fahr. or higher, and soon the 

 paper will float, or may be carefully lifted off. The film is 

 then washed under the tap, getting a gentle rubbing with the 

 soft pads of the fingers if necessary to remove any gelatine 

 adhering to the picture ; acidified alum may follow this wash- 

 ing. (See formula on page 63.) After the cleaning with 

 alum the plate is finally washed, dried and varnished with a 

 clear varnish usually called " crystal varnish." 



Bromide papers " A " and " B " may have a greater or 

 smaller amount of glaze conferred on them by one of the fol- 

 lowing methods. A fairly glazed surface may be obtained by 

 squeegeeing the finished and washed prints to a sheet of vulcan- 

 ite. "When dry they will come, or may be taken from the 

 vulcanite, and will have a very good glossy surface. Talced 

 glass may be used in place of the vulcanite. Or glass talced 

 and collodionized as on page 120 may be used, and this will 

 not only give a very high gloss but will tend to protect the 

 surface from scratches and from damp. 



Transferotype prints may be dried naturally and the paper 

 removed at any future time. Previous, in such a case, to 

 squeegeeing to the rigid support, the prints must be very thor- 

 oughly wetted in water, and they must not have undergone 

 alum treatment. Bromide prints and transferotype prints 

 may be developed with pyro, and by some workers the py ro- 

 de veloper is used with a view to warmer tones. The hydro- 

 quinone developer as formulated on a later page (page 1 52) 

 answers most admirably for bromide prints and also, of course, 

 for transferotypes ; for bromide prints on " A," " B," or " C" 

 paper we consider the hydroquinone developer superior in 

 certain respects to all other developers; the regularity of 



