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Invisible writing, 19th century
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Invisible writing, 19th century
Invisible writing. Etching of invisible writing being carried out using sodium hypochlorite (then known as Javelle water or Javel water), an alkaline disinfectant more commonly known as bleach. The word science has been written on a substrate using nitric acid. The word is invisible until dipped in the bleach, when it turns white due to the chemical reaction that takes place. Artwork from the ninth volume (first period of 1892) of the French popular science weekly La Science Illustree
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Media ID 6362651
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1892 Acid Alkali Annual Volume Demonstrator Dipping Etching French Hand Home La Science Illustree Lecturer Louis Figuier Magazine Popular Science Reaction Teacher Weekly Bleach Etch Laboratory Mono Chrome Nitric Acid
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This print captures a fascinating glimpse into the world of 19th-century science and art. In this monochrome illustration, we witness an intriguing process known as invisible writing being carried out by a European male scientist. Using sodium hypochlorite, also called Javelle water or bleach, as an alkaline disinfectant, he demonstrates how certain chemicals can reveal hidden messages. The artwork showcases the word "science" delicately etched onto a substrate using nitric acid. However, this inscription remains completely invisible until it is dipped into the bleach solution. As soon as it touches the liquid, a remarkable chemical reaction occurs before our eyes - the once-invisible writing magically turns white. This historical image hails from La Science Illustree, a popular French science weekly published in 1892. It offers us a glimpse into the laboratory of that era where experiments like these were conducted to amaze and educate curious minds. With his steady hand and meticulous technique, this knowledgeable lecturer captivates his audience with this mesmerizing party trick. The photograph not only highlights scientific curiosity but also emphasizes the artistic nature of such demonstrations. As we delve into history through images like these, we gain insight into how knowledge was shared and appreciated during earlier times. This snapshot serves as a reminder of human ingenuity and our never-ending quest for understanding the mysteries of our world.
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