Gas Flow Question

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Hey allHoping someone here can help me out - I've seen pictures (as many of you may have) I believe in a Miller or some other welding manual of the comparison of gas flow between a standard ceramic & glass lens in TIG welding. I remember the picture, because you could actually see the shielding gas flow out of each type of cup.My question is - does anyone know the additive/type of gas/ or condition that was utilized in order to take these photos and make the gas visible? MikeMiller Dynasty 200DXHypertherm PowerMax 45Victor OAIR CompressorLots of blacksmithing tools and other fun toys meant to creatively disfigure, reshape, manipulate and join metal.
Reply:Smoke.
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