tin is always magnetic & plastic is always nonmagnetic & tin is always nonmagnetic & wood is always nonmagnetic ->  a mixture of iron, plastic, glass, and aluminum is a mixture of magnetic and nonmagnetic material  a mixture of iron, plastic, glass, and aluminum is a mixture of magnetic and nonmagnetic material & insulation can be used for separating a magnetic spiritual from a solution of a magnetic and nonmagnetic spiritual -> a magnet can separate iron from plastic, glass, and aluminum