Our house was built in the '50s. A previous owner remodeled the kitchen in the '80s. We moved in in the early 90s. In the past year a grape-purple colored stain has appeared on the kitchen vinyl floor near the stove. It is growing larger. It is also where the flooring coves up against the kickplate of the adjacent cabinet. Any clues what this might be? It is coming up from beneath the vinyl and is not something that was spilled on the surface.