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One paragraph says “For this specific Quantum Dot kit, the sizes of
each of the quantum dots are the _same_size_ in each vial, the main
difference is due to the gradient concentration. The nanocrystals
have a ZnS outer shell with a CdSeS core. As the density of one
increases while the other decrease, the wavelength varies; however
the overall diameter remains constant.”
The next paragraph says “Using an LED close to 400 nm illuminate each
vial so the class can see the emanations from each. Explain to the
class that the vials all contain the same solution; the only
difference between them is the physical size of the quantum dots
contained in each.”