Sólo una ventana se abría en aquellos muros, tan sucia que la luz por ella filtrada, tenue e incierta, daba a todo un tinte grisáceo, intensificado por la espesa capa de polvo que cubría la estancia.
The solitary window was so dirty that the light was hazy and uncertain, giving a dull grey tinge to everything, which was intensified by the thick layer of dust which coated the whole apartment.