Various, Notes and Queries, Number 203, September 17…
“ I find the nitrate of lead a very useful salt in iodizing paper. Six grains of the salt to the ounce of water, and tincture of iodine added till a pale yellow, will give additional sensitiveness to iodized paper, if the sheets are floated upon the solution. This will shorten the time in the camera nearly five minutes; but it requires care, as it is apt to solarize.A weak solution of iodide of iron has also the same effect, and, if blotted off at once, it will not blacken by the use of gallic acid. ”
