ISO is a number scale that indicates the film's sensitivity to light. With ISO a higher number means that it is more sensitive to light, and a lower number indicates less sensitivity. So while an ISO of 100 can cover most photography, an ISO under 100 is much less sensitive to light, so you can shoot in brighter conditions, however this typically requires a tripod. An ISO of 400 and up is more sensitive to light, has a faster shutter speed, and is good for low light or action shots. The only downside to a higher ISO is more "noise" or grain on your photos, which can be used artistically if desired.
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A daguerreotype is a photo that was made on a silver coated surface, which was covered with mercury vapor to create the image. The process of making daguerrotypes was invented in France in 1839 by Louis J.M. Daguerre and Joseph Niepce. The photos were "developed" by the alloy of mercury and silver; by placing the silver plate, with the image on it, over a cup of heated mercury. Daguerreotypes became a flourishing enterprise in the 1840's for portraiture especially, and they were typically put in cases or framed.
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