nicotinamide (or niacinamide) crystals

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Lomonaut
Posts: 100
Joined: Sat Jan 27, 2018 5:30 pm

nicotinamide (or niacinamide) crystals

#1 Post by Lomonaut » Wed Nov 24, 2021 9:58 pm

Interesting substance (a form of vitamin B3) for photography. It tends to form globules of larger crystals inside a grainy sea.

This sample still wasn't completely finished crystallizing when I took the shots. Hot evaporation of organic substance solutions (usually a pinch in a drop of water) often leaves a glassy residue that slowly crystallizes when cooling.

10x/0.25 Nikon e-plan on Optiphot, polarisation, Olympus E-500 camera, enlarger relay lens. It's a bit unsharp in the left area, probably some misalignment in the perpetually improvised setup...
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PeteM
Posts: 2983
Joined: Tue Dec 06, 2016 6:22 am
Location: N. California

Re: nicotinamide (or niacinamide) crystals

#2 Post by PeteM » Thu Nov 25, 2021 5:49 pm

Thanks for posting. Especially like the third image.

Lomonaut
Posts: 100
Joined: Sat Jan 27, 2018 5:30 pm

Re: nicotinamide (or niacinamide) crystals

#3 Post by Lomonaut » Fri Nov 26, 2021 9:48 pm

Thanks!

A 4x would have been better for the globule images, but that can't be done on my Optiphot with this DIC condenser. I can get in focus with my Lomo 3.7x/0.11 with an original MBU-4 extention piece but the condenser just can't illuminate the whole field of view :(

Oh, here's another one, interesting greens:
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