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Why do propellors have white markings on their tips?

Here are a couple of examples: enter image description here

enter image description here

enter image description here

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It is so you will see a circle when they are turning. Without contrasting bright tips turning propellers are invisible, and pose a grave risk for someone who is deaf, wearing heavy hearing protection, or distracted by other noises.

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    $\begingroup$ ie: in moving pictures $\endgroup$
    – J...
    Mar 3 '21 at 14:01
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    $\begingroup$ @J..., excellent video! Do you mind if I add that to my answer for completeness? (It was late last night when I answered...) $\endgroup$ Mar 3 '21 at 15:36
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    $\begingroup$ Sure. It's not mine - I just grabbed a link from shutterstock. $\endgroup$
    – J...
    Mar 3 '21 at 15:38
  • $\begingroup$ On second thought, I think links are discouraged in answers because they can expire and break. $\endgroup$ Mar 3 '21 at 17:04
  • $\begingroup$ Yes, but that's largely if the substance of the answer is contained in the link. In this case it's just supporting material - the answer stands alone without it. That said, there are also some nice stills in the dupe so... $\endgroup$
    – J...
    Mar 3 '21 at 18:11

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