Provided herein are processes for the preparation of treated seeds. Generally, the processes described herein comprise contacting a seed with a liquid seed treatment composition, thereby producing a wetted seed. The processes further comprise contacting the wetted seed with a dry powder comprising an effect pigment, thereby producing a treated seed having a coating comprising the effect pigment. In some instances, the treated seeds may exhibit an attractive visual appearance and good flowability through manufacturing, distribution, and planting equipment.