Fordite KnifeFordite, also known as Detroit agate or Motor City agate, is old automotive paint which has hardened sufficiently to be cut and polished. It was formed from the buildup of layers of enamel paint slag on tracks and skids on which cars were hand spray painted (a now automated process), which have been baked numerous times. In recent times the material has been recycled into jewelry. These Gorgeous Stones Were Accidentally Created From Layers of Car