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30 days return guaranteeContact colour for testing the accurate fit of crowns, inlays, onlays, removable prostheses, telescopic crowns and clasps and the friction surfaces of precision fits. Easily removed after use. Application: The contact stain can be applied with a brush. Solvent evaporates in seconds, leaving a 3µm thick film. Any contact scratches the coloured film at exactly the point of contact. The base material then shines through and high spots can easily be detected.