Note (return) — PRAYING TO THE WEST.

Some of our oldest and most successful operators still adhere to and prefer the iodized paper prepared by the double process, which certainly effects a saving in the use of the iodide of potassium. The following is the easiest way of so preparing it:—Having floated your marked surface of the paper on a 30-grain solution of nitrate of silver, and dried it[4], immerse it for 20 minutes in a solution of iodide of potassium of 20 grains to the ounce, when it immediately assumes the desired colour. It is then requisite, however, that it should undergo the same washing in pure water as the paper prepared by the single process.