I am not sure if it is dye or paint. Is there a way to visually differentiate between the two? If it is painted, would it still be viable to strip and re-dye?
Honestly, I'm not sure. I'm just speculating since I always think of redyeing as going to a darker color to cover what was there before. I believe when Hermes takes in white bags to refurbish, they paint the white color on. Either way, I know Docride has taken beat up or damaged bags and dyed them black, so it's definitely doable. It's worth asking her about it on her thread in the Reference area, called "Vintage Bag Nightmares."