Add this liquid sizing to pulp at the end of the beating or mixing cycle during papermaking. It makes paper less absorbent and improves the stiffness of the paper so that ink or paint does not run or feather. It is an alkyl ketene dimer (AKD) based emulsion that has a neutral pH and meets archival standards. Treating your paper with size is essential if you are to use the paper for screenprinting, calligraphy or other artwork.
The size can also be applied to the surface of paper to reduce its absorbency, brush or spray and allow to dry.