Physical wear will for sure fade the pattern.
Ren wax (Renaissance wax) does come applied to the blade, but not universally. Personally, I have found the blades with heavier etch, more of a textured pattern and a darker gray/black have it. The examples with more of a smooth grey surface appearance do not. I have 2 made this year that have Ren wax on them from CRK.
It's $75+ to re-etch, and it cannot be done past a certain point, so generally speaking CRK will need to see the blade in person to let you know what they can do with it.
If you have the pattern/blade with Ren wax on it, or you use ren wax, I would highly recommend you do not use it on food. It's not going to kill you if you do, my 2 year old ate some and was perfectly fine. We called poison control as well. That being said, some people still smoke so do what you want.
All this info is recent info based correspondence on 1 of my recent 5 to the spa.