Sorting in the ATI STONE GROUP Color spectrum In general, Persian silks produced can be divided into two categories, dark and light, about 15% of which are light and 85% of which are in the dark category Whiteness Whiteness in Persian Silk Stones can manifest itself in three general forms: bevel white lines white halos or white spots, in which case they are called "white line", "cloud" and "Cotton flowers" respectively …