The z-directional penetration of starch was determined through an image analysis on 16 iodine stained cross-sectional images. The numerical penetration information was processed to represent a starch distribution (Simulated Starch Content distribution, SSC) and a dimensionless starch penetration number Q.
Lipponen, J., Lappalainen, T., Astola, J., & Grön, J. (2004). Novel method for quantitative starch penetration analysis through iodine staining and image analysis of cross-sections of uncoated fine paper. Nordic Pulp and Paper Research Journal, 19(3), 300 - 308. https://doi.org/10.3183/NPPRJ-2004-19-03-p300-308