Figure 8.

(a) Close-up of precipitate growth with the candy floss and Archimedean spiral regimes. The spiral segments sometimes are broken up into shorter ones by the expanding candy floss. These segments exhibit some bumps along their outline, possibly an indication of oscillatory dynamics similar to chemical garden filaments. (b) Detail of the lichen regime, which does not grow in a uniform manner. As a result, inclusions of outer solution may form within the precipitate, reacting with the inner solution at a later stage of the experiment. These areas are difficult to detect rigorously with image analysis, introducing uncertainties in the estimation of the effective density.