Abstract: An apparatus for properly mixing the constituents of a suspension is disclosed. The apparatus comprises a tank for holding a desired quantity of suspension with an inlet at its base having an air supply affixed to the inlet for supplying air into the tank and for combination with the suspension. Additionally a funnel is used for directing the air combined with the suspension upward through the tank and a dispersion member for properly dispersing particles within the suspension and for removing the particles from the sides and bottom of the tank may also be employed.

Abstract: A method of preparing a fluorescent magnetic composition useful in non-destructing testing of metal work pieces. The method of the invention utilizes a plasticizer in order to effect a more complete encapsulation of fluorescent pigment and magnetic particle powder by film-forming resin. The invention also provides for the composition made by the inventive method, as well as for the method of using the composition in non-destructive testing of magnetizable work pieces.

Abstract: Method and composition for non-destructive testing of a magnetizable workpiece wherein the surface of the workpiece is treated with an aqueous emulsion of a waxy solid having fluorescent magnetizable particles suspended therein, a magnetic field is created along the workpiece so that the magnetizable particles are attracted to imperfections therein, and then sufficient water is removed from the emulsion so that the waxy solid forms a film which contains the immobilized fluorescent particles which have become attached to imperfections in the workpiece. The film may be further protected by the application of finely divided abrasion resistant particles, such as glass beads or glass powder.