Hi, All Just finish the FLAT renovation. But find many dark strips on the floor (please see photo attached). HDB FLAT renovation just completed, found some problem on wood floor. On the floor there are a lot of black stripes. Not sure it’s because of wood quality or mold. Please help to identify it. Very much thanks! Information: 1. Floor: Burmese teak 2. Renovation time: 10/10/2013