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| ▲ | wongarsu 3 days ago | parent | next [-] |
| In the sense that everything is chemicals, yes. But you typically wouldn't describe a butterfly growing a wing or a welder making a blue weld from metals that are normally very much not blue as "growing from chemicals". I guess you could argue about the butterfly, but I think few people would say that chemicals are involved in welding steel, despite iron, carbon and tungsten being chemical elements |
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| ▲ | defrost 3 days ago | parent [-] | | The few people that would say that chemistry is part of welding "steel" (what type of steel? what type of metal? how about aluminium? etc) includes welders. eg: https://youtu.be/nfNvuTMDXNg?t=1420 In which a good machinist from Queensland, Australia discovers a crack and states he'll have to get the metal tested before he can repair the crack. You know, to match the chemical composition, expansion rates, etc. |
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| ▲ | jychang 3 days ago | parent | prev [-] |
| Well, the counterargument is that in theory, you can imagine a way to create structural color regardless of substrate. So imagine a technology that shines a laser on a car or a block of concrete and makes it blue; I'd argue that's correctly "without chemicals". Of course, I doubt you can do that to any random substrate, since the color will depend on the properties of the material. |
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