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1. A method for making a floorboard, or a floor element that is to be divided into at least two floorboards, the method comprising:
making a core from a sheet shaped material, from which a part of a locking system for vertical locking of the floorboards is to be formed, wherein the method further comprises: impregnating and/or staining the core surface with a substance at least in portions which in the completed floorboard will constitute a joint edge of the completed floorboard, and arranging an surface layer on the core surface.
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