3 easy & cheap ways to oxidize steel to black and remove rust

In this video tutorial, I will show you how to turn steel black with:
- Coca-Cola
- citric acid
- vinegar

00:00 preparation
00:29 ingredients
00:45 black oxide coating process
03:00 blackening result with citric acid
03:27 blackening result with vinegar
03:56 blackening result with Coke
04:13 method comparison