Nicatonic Acid, or Vitamin B3 looks interesting under the microscope and displays some birefringence.
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Salicylic acid, a key ingredient in anti-acne products looks quite interesting under the microscope, displaying a small amount of birefringence.
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Urea (or carbamide) displays some cool birefringence under the microscope, have a peek!
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Sulfur is an abundant element found in all living cells, what does it look like under the microscope?
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Caffeine, the popular additive in all sorts of beverages (including many of my favorites) looks stunning by polarized light microscopy!
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