The colors are added in, of course, with it being an electron microscope image. Another picture:

  • Wogi@lemmy.world
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    27 days ago

    These are manufactured differently from most of the stuff you’d be looking at.

    Rather than milling and grinding, the needles are made from a sheet of stainless that’s rolled and welded, then drawn down to whatever size it needs to be, basically stretching the material out. Kinda like when you make a snake with silly puddy and pull it apart.

    Then the points are ground in. Gives you a ridiculously smooth finish.