Hi, my friend and I recently bought ourselves a Cold Steel Tanto Lite and Outdoorsman Lite respectively and both agreed that we weren't keen on the shiny finish on the 4116 blades. I looked around online for a fix but no-one seemed to be doing anything so I risked it and gave both an acid wash, amongst other treatments. I heard that this steel wouldn't react well but it actually turned out better than I expected. Here are some pics
https://i.imgur.com/jR7C4Sa.jpg
https://i.imgur.com/HEoPlUH.jpg
https://i.imgur.com/rlaCsUD.jpg
https://i.imgur.com/GlE50Mx.jpg
https://i.imgur.com/jR7C4Sa.jpg
https://i.imgur.com/HEoPlUH.jpg
https://i.imgur.com/rlaCsUD.jpg
https://i.imgur.com/GlE50Mx.jpg