Tack Thickener thickens Akua Liquid Pigment for heavier roll-up applications. It can be used for creating denser Akua Liquid Pigment roll-ups onto monotype plates or woodblocks. It is not as thick as Transparent Base or Akua Intaglio ink. It is medium amber in color with a thick consistency. Tack Thickener cleans up with soapy water.