What you propose is essentially the same as salted paper using iodine in place of sodium chloride. The paper would have to be developed using a conventional developer to produce a negative image. There would be little similarity to what you propose and the Daguerreotype process which forms a positive image created by mercury vapor.
A Daguerreotype image is composed of silver which has a rougher surface than the surrounding silver. The rough surface scatters the light and so appears darker than the surrounding bright silver.