Caffeine crystals appear as fine, colorless needles when observed under a microscope. These crystals are typically needle-shaped, resembling delicate white branches. Each needle consists of multiple stacked layers, which give them a unique appearance when magnified.

Caffeine crystals under a polarizing microscope with Berek filter. The image shown above is a shot that was captured and made out of 25+ images in a comprehensive grid covering only part of the sample using a Canon ESO 5D Mark III 22 megapixel camera.

With polarized light (crossed polars), and low magnification, caffeine fields are often composed of large colourful areas with random shapes. It is difficult to see that each area has very fine cracks or fault lines which tend, for the most part, to be parallel.

Foods containing caffeine often go unrecognised, making the task of limiting intake of the stimulant challenging. But have you ever wondered about how caffeine would look underneath a...

In this study the structural formation of caffeine monolayers on a Au (111) surface was analyzed by scanning tunneling microscopy (STM), low energy electron diffraction (LEED), x-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations.