A number of companies are currently producing chemical toners using latex aggregation approaches. This communication attempts to provide an understanding, based on the principles of colloid science, for each of these different processes. While the starting latex for each aggregation scheme have many properties in common, the toner that forms may show dramatic differences in the image development and fusing performance. These differences arise from the coagulant used to assemble the latex and the aggregation processes itself. The potential for future advances in this toner technology is given.