Frogwatch wrote:
On Sep 3, 2:32 pm, H the K wrote:


You can see the diff tween treated and untreated metal? I have
samples of carbonitrided parts ranging from gear teeth to simple bar
stock and after polishing (or before) I cannot see the diff.


Even though I only have two degrees in English, I can sometimes discern
bare metal under a coating when the coating is scratched through or worn
off.

Maybe they are dueling scars.