252 PHOTOGRAPHIC FACTS AND FORMULAS 
paper is used, either matt or glossy, which may be prepared as 
follows: 
Gelatine 100 g 134 oz. 
Barium sulphate 30 g 230 gr. 
Glycerine 5 ccm 38 min. 
Water 940 ccm 14 oz. 
Soak the gelatine in water, dissolve by heat, and add the 
baryta rubbed into a cream with the glycerine. Add very 
carefully, almost drop by drop, with constant stirring: 
Chrome alum 16g 13 gr, 
Water 60 ccm 2 oz. 
Paint the mixture thickly over the paper, or else float it 
twice, hanging up by opposite ends each time. Obviously, 
single transfer or commercial baryta paper may be used. 
WaxiInG SOLuTION,—The temporary support has to be 
waxed prior to use, and the following may be used: 
Beeswax 20 g 154 gr. 
Powdered resin 20 g 154 gr. 
Turpentine 1000 ccm 16 oz. 
Melt the wax in a water bath, add the resin, and stir until 
dissolved; then add the turpentine gradually with constant 
stirring. This takes from 12 to 24 hours to dry; if ether be 
substituted for the turpentine, it will dry in a few minutes. 
Caution.—The water in the bath should boil, and then the 
gas be turned out, as the vapours of both turpentine and ether 
are explosive. This should be applied to the paper with a 
pad, polished off with a dry pad, and then hung up to dry. 
A.LuM BATH For DISCHARGING BICHROMATE STAIN.— 
Alum 62:5 2 1 oz. 
Water 1000 ccm 16 oz. 
CoLLODION FOR DoUBLE TRANSFER FROM OpaL.—This 
gives an extremely fine matt surface, without any glaze, if 
