“Consistent Mixing and Dispersing: The Theory and Technology of Incorporating Powders into Liquids,” a two-day seminar presented by Lisa Hahn, Flexo Tech, Inc., and Peter Holman of Holman Engineering, Inc., will be held Aug. 10-11 in Chicago.      Ms. Hahn is the president of Flexo Tech, Inc., a research and development organization which provides laboratory services, formulation development and training to the printing ink and allied industries. She has published several articles in Ink World...