When we moved from black powder rounds to metallic cartridges, how did they make the primers and crimp the brass? - Quora
Birchwood Casey Brass Black Metal Finish, 3-Ounce : Hunting Cleaning And Maintenance Products : Sports & Outdoors
Birchwood Casey Fast-Acting Brass Black Metal Finish to Blacken or Antique Brass, Copper, Bronze Parts
Zevni Matte Black & Brass Gold Pendant Lights Fixture, 6 in. Modern Pendant Lighting for Kitchen Island and Dining Room Z-X7EBQB7B-4702 - The Home Depot
Brass M2.5 Standoffs for Pi HATs - Black Plated - Pack of 2 : ID 2336 : Adafruit Industries, Unique & fun DIY electronics and kits