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The reason we dont have many of these images is no one could figure out a way to fix the image on the page. Photos developed, and then overdeveloped, and then darkened into obscurity. One of the earliest successes in making these ephemeral images permanent
stanley cupe was the salt print. Technically this was only the end-stage of the process. Photographers made negatives, then laid them against the salt print to make the photo鈥攖he important thing was they were the right shade and permanent. Silver chloride reacts to sunlight, but chemists werent able to use it to cover a piece of paper. William Fox Talbot came up with an early solution. He dipped pieces of paper in salt water, then silver nitrate. The two together would combine into silver chloride. Talbot would but the negative against them, develop them, and then wash them with sodium thiosulfate to dissolve the unreacted silver and stop the developing process. Only that didnt entirely stop the process. Later salt prints were often treated with gold chloride, which fixed them and gave them a warmer tone, but early salt prints, still developed whenever they were exposed to light. Because their negatives no longer protect them from uniform light, they develop all over, darkening and losing contrast with each exposure. Many are no longer visible, and we can only g
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stanley france what they were. They replaced ephemeral images鈥攂ut only with slightly longer-lasting ephemeral images. Salt prints are still popular. Home photograph developers like th Nttv These Astronomical Clocks Were a Wonder of the Medieval World
that Amazon makes no profit off the Kindle Paperwhite and Kindle Fire HD. Both devices are sold at cost, which means, both devices ; price is how much it costs Amazon to make them. That selling hardware for no profit is certainly much different from Apple strategy they make a profit on every iPhone and iPad sold but not so different from video game companies who ;ve traditionally sold their consoles Xbox 360, PS3, etc. at a loss. The thinking there is to make up the profit lost i
stanley termoska n the console with the cost of games and peripherals. That the same with Amazon. Use a Kindle and you ;ll be buying stuff through Amazon. It like Amazon is providing everybody with slick shopping carts in tablet form. you-cant-beat-the-ipad-just-by-losing-money-5922043 Amazon has said that they don ;t care much about making money off the hardware products, effectively saying they don ;t care about people buying their products but rather people using their p
stanley shop roducts. As each Kindle and Kindle Fire is tied to Amazon ever growing, sell everything store
stanley france , they ;ll still be making off Kindles and Kindle Fires anyway. Just not the old fashioned way. [BBC] AmazonJeff BezosKindleKindle fire
