190 PHOTOGRAPHIC FACTS AND FORMULAS 
site corners to those previously used. As an alternative to 
this, the paper may be pinned by two corners to a flat board, 
and the salting solution freely applied with a broad flat brush. 
The solution is allowed to dry, and the operation is then re- 
peated. Increase of the arrowroot by 50 per cent increases 
brilliancy of the surface. For a gelatine size one of the 
following may be used: 
Gelatine 2g 15 gr. 
Ammonium chloride 18g 138 gr. 
Sodium citrate 18g 138 gr. 
Water 1000 ccm 16 oz. 
Or: 
Gelatine 4.5¢ 34 gr. 
Ammonium chloride 18g 138 gr. 
Sodium citrate, dry 215s 165 gr. 
Salt 7g 54 gr. 
Water 1000 ccm 16 oz. 
Ori: 
Gelatine 7g 54 gr. 
Ammonium chloride 14g 108 gr. 
Water 1000 ccm 16 oz. 
The more gelatine used, the higher the gloss of the resultant 
prints. The more citrate used, the more rapid the paper, with 
less contrast. Soak the gelatine in the water, melt by heat, 
and add the salts. 
Matt AND SEMI-MATT Lac Papers.—With these bleached 
shellac with gelatine is used as a size. Unfortunately, 
bleached shellac is quite insoluble in aqueous mediums, and 
its solubility is very variable, unless freshly bleached: 
Bleached lac 83 g 637 gr. 
Borax 42 ¢ 32a 88: 
Water 750 ccm 12 oz. 
The lac should be broken up small, added to the borax solu- 
