Daguerreotype photography was the first, commercially successful photography in the world, with a technique consisting of expositing a copper plate coated in silver and sensitized with iodine to light in a camera and then developed it in the dark by holding it over heated vaporising mercury. Although capable of producing permanent photos that wouldn’t be damaged by extra exposure to light using a solution with ordinary table salt, the process had one serious drawback: It took 10 minutes to develop so it was impossible to capture moving targets unless they stood still for a very long time, like this man having his shoes shined in "Boulevard du Temple".