FABER-CASTELL-Pitt Artist Pens: Shades of Grey. Pitt Artist Pens are perfect for illustrators; animators; artists and more! Each pen features high-quality India ink which is extremely fade resistant; lightfast; highly pigmented and acid free. This package contains six Pitt Brush Pens in colours 232; 233; 235; 272; 273; and 274. Conforms to ASTM D4236. Imported.