In recent years rather than transfer delaminating murals, conservators are choosing to reattach the plaster to the wall surface by grouting (the injection of mortars or other adhesive materials between the two surfaces). The mortars used often exhibit unreliable setting, shrink upon setting, have excessive strength and low porosity, and contain soluble salts. A specification for an injectable mixture was designed which considered and rejected currently used materials (lime casein, lime-synthetic resin emulsion, lime-synthetic resin emulsion-fluid coke, synthetic resin emulsion, cement, thermosetting synthetic resin) in light of their specification. They then tested more than 80 hydraulic lime/filler/fluidizer mixtures for injectability, mechanical strength, shrinkage, and specific gravity. Laboratory tests were followed by two years of field experiments at nine ltalian sites. A chaux blanche (lime) and a crushed brick mixture (with sodium gluconate and Primal AC33) in a one to one ratio was found to be most successful. See also AATA 20-851 for related study and 21-1334 for entire proceedings.