This document discusses automatic ink viscosity control systems and their benefits over manual control methods. It begins by explaining what ink is composed of and various printing applications. It then discusses how manual viscosity measurement using a Zahn cup is inaccurate and can lead to wasted ink, solvent, and plastic. The document presents data showing that automatic control systems can measure viscosity to within 1.1 cSt, while the Zahn cup has a margin of error of 15%. A customer example is given where automatic control reduced ink consumption by 20% and solvent/varnish consumption by 30%, paying for itself within 2 months. Reasons for good ink circulation and tank maintenance are also provided. The document advocates for more accurate viscosity measurement to reduce waste and save money