Cool picture I took at work a while back!

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Ben90

Platinum Member
Jun 14, 2009
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333fv.jpg
 

destrekor

Lifer
Nov 18, 2005
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Since salt and sugar have said, I will guess Caffeine.

My other secondary guess was crystalline H2O, but I'm quite confident that is definitely not crystalline water under that microscope.

Really, I don't think it's either NaCl or Sucrose (C12H22O11 or pure C6H12O6) and caffeine is the only other crystalline solid of which I can even think that is solid.
 

Fenixgoon

Lifer
Jun 30, 2003
31,683
10,127
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the answer: rust :)

ice would sublimate under the vacuum in the SEM (unless you were in an ESEM, in which case you'd be OK i think).