Stock cartouche highlighting?

[Old Scratch]

I sold an old G-43 several years ago. I didn't keep it primarily because the metal had been reblued and the stock heavily sanded...to the point where the stock cartouche was barely visible.

I ran into the guy I sold it to at a recent gunshow...complete with my old G-43. He had done a good job of highlighting the metal stamps and numbers in white, something which I have always found attractive. What wowed me was the job he did in blackening in the stock cartouche...it looked really great.

Any ideas as to how he did this?

 

[Fishbed77]

Rubbing some pure tung oil into my Garand stock really brought out the cartouche.

It didn't make it black, but made it pop nicely with a similar tone to the walnut, but darker.

Not sure if tung oil is an accurate finish for a G-43, though.