Previous backings of mosaic panels in the British Museum included slate, marble, cement and plaster; these make handling difficult due to size, weight, and fragility. This paper describes a backing developed from a commercial method by the Conservation Division of the Museum using a non-toxic resin. Provision is also made for cutting large panels into smaller sections and their reassembly. After experimenting with a mock-up mosaic the method was used on a panel from Carthage lifted and backed with plaster in the 1850's. A tracing was made on acetate sheet and the panel faced up with a poly(vinyl acetate) emulsion and scenic gauze. After turning the panel over, the plaster backing was removed and the tesserae coated with poly(vinyl acetate) emulsion. The panel was cut into four sections and a thin layer of plaster and hessian applied. When the plaster was dry, a layer of vermiculite/resin (Araldite MY753/HY956) incorporating Weldmesh galvanized steel was put on, setting into place nuts and washers which would be used to locate the pieces together with aluminum channeling. Finally the panel was turned face up and the facing layer removed. -- AATA