Agar gel loaded with micro-emulsion could be used to extract lipophilic Refurbished Grinder materials from porous surfaces.The physical properties of the gels are good enough for a conservation work.They allow the micro-emulsion to flow on the porous surface and to wet it but maintain the micro-emulsion in its Mens Belt structure and prevent the formation of rings.
The evaporation of the solvents is slowed down and the gels can be used during a long period.