Product Name: Solvent Black 28 CAS No.: 12237-23-9 C. I. No. Solvent Black 28 Chemical Family: AZO series, Metal Complex solvent black 28 application: 1. Wood stains 2. Printing ink 3. Aluminum foil coloring 4. Hot stamping foil coloring 5. Leather finishes 6. Baking finishes 7. Stationery ink 8. Plastic coating.