I give its use as furnished me by an old and experienced operator, and published in Humphrey's Journal, vol.i.p.

180: "As the process of using chloride of iodine may be of interest to some of our subscribers, I take pleasure in giving the following manipulation.

To one ounce of chloride of iodine add two ounces of water; place this mixture in a coating-box, the same as quick stuff; coat the plate with dry iodine to a light yellow, or lemon color; then bring the coating to a deep pink over the chloride.

The plate must be recoated over the dry iodine." This combination has been very successfully used in one of our most extensive establishments in this city, and the superiority of the pictures produced by it was considered as an equivalent for the additional time required to bring out the impressions.
Chlorine as an Accelerator .-- I shall here refer to but a single experiment in which I employed chlorine gas for coating the plate.

I was provided with a retort, the neck of which was fitted to the jar of my coating-box, through a hole drilled for its reception.