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I am trying to work out the mass added to a small glass sphere when it is picked up with bare fingers.

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  • $\begingroup$ Wouldn't that depend a lot on your skin type, how moist your skin is, what stuff you have touched before,... ? $\endgroup$
    – skymningen
    Nov 11, 2015 at 8:12
  • $\begingroup$ Yes, but there must be an average. I am weighing stuff to an accuracy of a microgram $\endgroup$
    – Dirk Bruere
    Nov 11, 2015 at 8:56
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    $\begingroup$ Figure in the range of a 25 micron cube of oil perhaps. $\endgroup$
    – bandybabboon
    Jul 3, 2022 at 9:26

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The average thickness of a latent fingerprint is .1 micron. Or, <10 micrograms.

https://www.ojp.gov/pdffiles1/nij/225327.pdf

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    $\begingroup$ Presumably that would be for a full print from the first joint of the finger (i.e. the bit that they do the fingerprint ID from), and would decrease with less contact area and increase with more area covered. I wonder how big the "small glass spheres" OP is using are? $\endgroup$
    – bob1
    Feb 19 at 20:20

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