The colors are added in, of course, with it being an electron microscope image. Another picture:
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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.
Interesting info, thanks!
But I think you may have accidentally typed in the wrong thread? I was talking about the image manipulation, not the manufacturing :-)
Sure did. Whoops!