DXC compostable bag is using certified raw materials that both home and industry compostable. The sliver color you see is 2 micron coating on the compostable film to provide oxygen and moisture barrier to prolong shelf life. And according to the Europe and America standart, the whole pouch made of 95% compostable material is defined as compostable pouch. DXC Pack all compostable bags are made of more than 98% compostable materials. Our compostable coffee packaging has been verified by most authoritative testing agency TUV in Germany. We can provide samples for your testing too, Contact us!