Diacenaphtho[1,2-j:1′,2′-1]fluoranthene?and sulfur mixture for roasting (in 20 hours of roasting temperature up to 350 ℃, and keep the temperature for more than 8 hour), the product with Sodium hydroxide in 100 ~ 110 ℃ processing, then filtering, and taking sulfuric acid precipitation. Note: the Diacenaphtho[1,2-j:1′,2′-1]fluoranthene?and nitrocellulose derivatives (namely C.I. Sulphur Brown 60, C.I. 53325 and C.I. Sulphur Brown 51, C.I. 53327) the dye it has excellent resistance to sun fastness.
