<p>
 For this, I mixed regular table sugar with tap water and let it air dry.  Then observed this at the edge.
 <img alt="Table sugar" class="alignnone size-medium wp-image-41932 gcloudimg" data-attachment-id="41932" data-comments-opened="1" data-image-meta='{"aperture":"2.2","credit":"","camera":"iPhone SE","caption":"","created_timestamp":"1529341841","copyright":"","focal_length":"4.15","iso":"200","shutter_speed":"0.066666666666667","title":"","orientation":"1"}' data-image-title="Table sugar" data-recalc-dims="1" height="225" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_41931/FoldscopeSugar.jpg" width="300"/>
</p>
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Table sugar with polarizers

Puchina | Tue, Jun 19, 2018, 3:58 AM

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Foldscope Lens Magnification

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