Archaeologists at the Rakhigarhi site in Haryana have announced the discovery of a specialized administrative wing dedicated to the production and standardization of seal-inks. This Mature Harappan facility contains an unprecedented archive of clay tablets detailing the chemical ratios of mineral-based pigments, including hematite and manganese, used to darken the impressions of steatite seals for official trade documentation.
The excavation team uncovered intact grinding chambers and stone vats where natural binders were processed. These findings suggest that the Indus Valley Civilization maintained a centralized authority for "visual authentication," ensuring that merchant seals across different urban centers remained legible and consistent. This discovery provides the first direct evidence of a professional class of ink-masters within the Harappan bureaucratic hierarchy.