Increasing water concentration results in the formation of hydrated silica gels and colloidal silica dispersions. Colloidal particles are the components of a colloid. Such a photographic emulsion consists of silver halide colloidal particles dispersed in a gelatin matrix. In particular, the reaction is not observed with suspensions of colloidal silica. The photoacoustic immunoassay can be applied to lateral flow tests, which use colloidal nanoparticles. There are instances in which silver nanoparticles and colloidal silver are used in consumer goods. Zeta potential is a scientific term for electrokinetic potential in colloidal dispersions. The simplest heteroaggregation process occurs when two types of monodisperse colloidal particles are mixed. The zeta potential is a key indicator of the stability of colloidal dispersions. Ligand exchange can also be used to promote phase transfer of the colloidal particles. While it appears similar to sedimentation in colloidal dispersions, the mechanisms are different. Additionally, it is used to break up aggregates of micron-sized colloidal particles. Large batches of quantum dots may be synthesized via colloidal synthesis. It is a colloidal and most often a crystalline material. Localized surface plasmon resonance creates brilliant colors in metal colloidal solutions.