Photography first became possible in the 1820s, but reasonable photographs did not become possible until about 1850 when the positive/negative concept was developed. From then until the 1890s it remained the domain of the proffessional or well heeled amateur, with wet pla tes prepared on the spot and immediately before use. Some photographs, using large format cameras were of outstanding quality. Film speeds were very low, so still objects were most successful. Family portraits became common in the 1860s.  In the 1890s George Eastman started selling the Kodak camera with multiple small plates precoated with gel emulsion. The whole camera was sent back to the factory for developing, printing and reloading the camera. This setup was soon replaced by roll film, initially paper, but soon cellulloid, and with the box 'Brownie' amateur photography really took off. By the early 20th century, many other  companies were into the act, and amateur photography became commonplace. 35mm, using movie film was introduced early in the 20th century, but did not become common until after WW2. SLR cameras were rare until the 1960s or later.  Colour photography was first introduced in about 1900, but did not become available to the public until the 1930s, and remained very expensive and hence rare until the 1950s, when lowering costs and post war prosperity led to a boom in colour photography - as 35mm slides. Colour prints remained rare until the 1970s, when they gradually replaced slides as costs decreased.  Sepia  prints were always an upmarket variant of black and white.  Hope this helps,  John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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