A variant of the sandwich ELISA uses TMB and horseradish peroxidase in the "surface" type of this kind of reaction. This reaction commonly occurs in supersaturated solutions, because a certain factor 
A variant of the sandwich ELISA uses TMB and horseradish peroxidase in the "surface" type of this kind of reaction. This reaction commonly occurs in supersaturated solutions, because a certain factor is exceeded, and in soils, this kind of reaction produces crystal growth. This reaction does not occur in solutions containing ammonium ions or nitrate ions, according to the solubility rules. For 10 points, name this kind of reaction in which two dissolved ions form an insoluble compound.
A variant of the sandwich ELISA uses TMB and horseradish peroxidase in the "surface" type of this kind of reaction.
{precipitation} reaction