Sorry if this has been asked before. I do have and use ferric acid I’ve made to etch Damascus steel knives I’ve made. My question I posted is because if a person that has had and used one of my knives to the point the Damascus is dull wants it to look really good again without making the more/harsher ferric acid. Is the vinegar/peroxide a decent alternative? Is it still bad Mojo?. I’ve heard of the strong coffee etch but I don’t know if it’s really as effective . I read yes/no. What you say o wise ones appreciate any replies.