Various, Notes and Queries, Number 167, January 8…
“ Talbot's, the iodide of silver is formed in a state of purity, before being rendered sensitive: and as, for this end, a small quantity only of nitrate of silver is necessary, a very dilute solution will answer the purpose as well, or even better, than a strong one; but by the other method, the paper being prepared with iodide of potassium only, or with some other analogous salt, the iodide of silver has to be formed by the same solution that renders it sensitive. ”
