I have a question for this thread since you guys know a lot! I accidentally patina'd a carbon steel blade several years ago with CLR and I liked the uniform dark wash it created. Seven years out it still looks good and seems to not have any issues. Can any of you tell me if there's a chemistry reason why I shouldn't use CLR again in the future to do a uniform dark patina intentionally? Enclosed are pictures of the knife. It's been used for years since the CLR.