The shape of  Silver coated Aluminum powder are scaly, and because of the shape of the scales, this product have a metallic color and shielding function. Its chemical composition is actually "Aluminum", not "Argentum".
The reason of Silver Aluminum Powder reflecting light is that is made of Aluminum ,which with light color and high metallic luster. The surface is smooth so that it can reflect 60%-90% of visible light, ultraviolet light and infrared light.