1. n. 
An all-inclusive term to describe various progressive interactions between clay minerals and water. In the dry state, clay packets exist in face-to-face stacks like a deck of playing cards, but clay packets begin to change when exposed to water. Five descriptive terms describe the progressive interactions that can occur in a clay-water system, such as a water mud.
See: acrylamide acrylate polymer, Bingham plastic model, calcium contamination, calcium mud, capillary suction time test, closed mud system, colloid, colloidal solids, dewatering, dispersant, encapsulation, gel strength, gyp mud, hydrophilic, hygroscopic, inhibitive mud, ion exchange, kaolinite, lignosulfonate, lime mud, low-yield clay, make-up water, montmorillonite, native clay, peptized clay, peptizing agent, phosphate salt, PHPA mud, potassium mud, prehydrated bentonite, prehydration, rheology, smectite clay, sulfonated polystyrene-maleic anhydride copolymer, tannic acid, tannin, vinyl acetate-maleic anhydride copolymer, water clarification