where 𝑄 𝑟𝑒𝑙 (𝑡) is the fraction of dye released at time 𝑡, 𝐷 is the diffusion coefficient (corresponding to 𝐷 𝑐 or 𝐷 ℎ depending on whether the symmetry is cubic or hexagonal), and 𝐿 = 0.3 cm is the length of the mini-beaker. Note that, compared to Ref. , the formula has been adapted to account for the presence of a single release interface at the top of the mini-beaker. Errors in the fitting parameters were estimated following the iterative procedure described in Ref. by considering 2000 iterations.