oct. — dec. 1856.] Paper Process in Photography. 73 



Let pure milk from the cow stand until it is sour, for each quart 

 of milk beat up the whites of three eggs ; add these to the milk in 

 any convenient vessel, porcelain is best — if brass or copper uten- 

 sils be used they should be well tinned. Boil gently over a slow 

 fire for a few minutes and the caseine will be taken up by the 

 coagulated albumen. When cold, filter through a double fold of 

 cambric, and then through bibulous paper, the latter is a tedious 

 process unless the operator has a large funnel which he can fill and 

 leave whilst he is attending to other matters. If properly made it 

 should be clear and transparent and of a straw colored tint. 



To each ounce of whey or distilled water add the following in- 



gredients — 



Iodide of Potassium grs. 7 J 



Bromide of Potassium „ 2 J 



Cyanide of Potassium „ 0 



Chloride of Sodium, dry, (table salt) „ OJ 



Sugar of Milk „ 12 



Crystallised Honey (from the bottom of a jar). . . „ 5 

 Dissolve, and add to the mixture as much re-sublimed Iodine 

 as will produce a brown sherry color: try 10 or 12 grs. to the 

 quart of 40 ozs. — and if that is found insufficient, add more, as the 

 exact quantity is of no importance. The Iodine being rapidly ex- 

 tracted from the solution by the starch in the paper will require to 

 be renewed occasionally, the necessity being indicated a by the pale- 

 ness of the solution. It is some hours before the whole of the 

 Iodine is dissolved. 



Filter the above solution into a dish to the depth of one inch, 

 or more if the dish is deep enough. Take a paper by two adjacent 

 corners and place the other end upon the solution so as just to 

 touch it, without pause lower the hands gradually and carefully to 

 exclude air bubbles, for the better seeing of which the iodizing 

 tray should be placed between the operator and a window. Let the 

 paper lie for a moment until it is wetted, then take it up by the 

 corners nearest to you and place the other side of the paper upon 

 the solution in the same way. Then by the help of a hent glass 

 rod, or by tilting the tray, cause the solution to flow over the paper. 



K 



