A beverage container comprising a base, a side surface, an upper end, and an interior volume formed by the base and the side surface, and a personal identifier positioned upon the base of the of beverage container for stain identification and personalization. A method of using a beverage container for personalization of a stain generated by spilling liquid upon a first surface from the beverage container and transferring a portion of the liquid spilled using the surface of the personal identifier affixed to the beverage container to a second (dry) surface, which may be paper.