To accurately calculate ink transfer efficiency, set the spectrophotometer to its trapping function and measure the densities of the magenta and yellow solid layers alongside the red overprint area. The device utilizes the Preucil formula to display the second ink's acceptance ratio, which should ideally range between 75% and 90% in standard offset printing. If this index falls below the required threshold, it indicates a deficiency in secondary layer acceptance, leading to an immediate and unwanted color cast in the final output.

An immediate solution to resolve this technical issue is reducing the second ink's tack using specialized additives while simultaneously increasing cylinder pressure in the respective printing unit. By continuously monitoring this value throughout the production run, you can ensure chromatic stability and prevent deviations in the color constancy index over long shifts. This scientific approach allows for the identification and real-time correction of technical trapping errors before they become visible to the operator's eye, effectively minimizing printing waste and maintaining high quality.