Aging or Etching with Vinegar

[Alden Cole]

Hello all, I thought I had seen somewhere aging a knife blade or etching for a Hamon with vinegar. Has anyone done this or know anything about this? Thanks!

 

[Drew Riley]

I've etched hamons before. Heating the vinegar first helps it work a bit faster.

 

[Alden Cole]

Ok cool. Thanks!