Under the TIA/EIA-598-C standard, the universal 12-color sequence is: 1-Blue, 2-Orange, 3-Green, 4-Brown, 5-Slate (Gray), 6-White, 7-Red, 8-Black, 9-Yellow, 10-Violet, 11-Rose, and 12-Aqua. This sequence repeats for cables with more than 12 fibers., 48, 96, or 144 fibers), the industry uses a “Tube and Fiber” system. Example: What. Prysmian uses the US industry standard repeating 12-color sequence. Color Code for 12 Fibers: Blue Orange Green Brown Slate (Gray) White. Critical Exception: Outdoor cables are almost always black (for UV resistance), regardless of the fiber inside.