Cuvettes to be used in circular dichroism experiments should never be mechanically stressed, as the stress will induce polarization of the glass and affect the measurements made.
Cheap cuvettes are round and look a lot like test tubes. Disposable plastic cuvettes are often used in fast spectroscopic assays, where time is more important than three digit spectral accuracy.
While some cuvettes will be clear only on opposite sides, so that they pass a single beam of light through that pair of sides (often the unclear sides have ridges or are rough to allow for ease of handling), cuvettes to be used in fluorescence spectroscopy[?] are clear on all 4 sides.
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