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U + A

 
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Sumguy01



Joined: 28 Jan 2013
Posts: 1413
Location: Ketchikan Alaska USA
PostPosted: Tue Mar 26, 2019 9:01 pm    Post subject: U + A Reply with quote
Urea + Alum dissolved in vinegar, fast dry in oven, no cover glass, 4x and 10x obj. polarized with retarder, # 4 is Zerene Stack,






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Jacek



Joined: 02 Oct 2011
Posts: 5351
Location: Poland
PostPosted: Wed Mar 27, 2019 1:42 pm    Post subject: Reply with quote
Nice Very Happy
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https://photos.app.goo.gl/MV9IynUtBdaKkVj53
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grgh



Joined: 09 Mar 2013
Posts: 314
Location: Lancashire. UK
PostPosted: Wed Mar 27, 2019 4:06 pm    Post subject: Reply with quote
kaleidoscope springs to mind, beautiful colours.
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used to do astronomy.
and photography.
Zeiss Universal Phase contrast.
Zeiss PMII
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Robert Berdan



Joined: 18 Oct 2017
Posts: 155
Location: Calgary
PostPosted: Thu Mar 28, 2019 3:18 pm    Post subject: Nice crystals Reply with quote
Nice crystals. I have played with Urea as melts and from solutions and my samples looked very different. It is amazing how small changes to the solvent, drying condition or additions to the solution can change the shape of the crystals. Even in a single batch I see a lot of variation.

Nice photos.
RB
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Sumguy01



Joined: 28 Jan 2013
Posts: 1413
Location: Ketchikan Alaska USA
PostPosted: Thu Mar 28, 2019 11:04 pm    Post subject: Reply with quote
Very Happy Thanks for the nice comments.
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