Systematic Front Distortion and Presence of Consecutive Fronts in a Precipitation System

A new simple reaction−diffusion system is presented focusing on pattern formation phenomena as consecutive
precipitation fronts and distortion of the precipitation front. The chemical system investigated here is based
on the amphoteric property of aluminum hydroxide and exhibits two unique phenomena. Both the existence
of consecutive precipitation fronts and distortion are reported for the first time. The precipitation patterns
could be controlled by the pH field, and the distortion of the precipitation front can be practical for
microtechnological applications of reaction−diffusion systems.