Oooppsssss, i did it again, i play with your heart.....No, no stop!!!!!!
Here is another example: a salawar. Unfortunatly the very edge is quite pitted but anyway the result is nice

. I decide to stop also about african blade: I have rethought to the many pictures of the beginning of last century that shows many warriors of Central Africa with theirs shining swords and so i have decided to leave my african pieces as they are.
Katana, i think that the etching with vinegar is a gentle way, especially if you use the vinegar diluted with water (proportion 1 liter of vinegar : 2 of water) and cold (the process is faster if you heat the water).