Bluish oxidation

[Freds Edge]

I have made a few Chefs knives from 52100 and after use they have a light blue oxidation on the blade, has anyone else experienced this.

 

[J. Doyle]

I have made a few Chefs knives from 52100 and after use they have a light blue oxidation on the blade, has anyone else experienced this.

Yes it's patina. Meat, potatoes and onions often leave blue/purple patina.

 

[Freds Edge]

Thanks John, I thought that may be the case.