Can’t figure it out. A couple of weeks ago I etched this knife. Then with the scraps of the Damascus I am making this pendent. Same Damascus, same container of acid. It won’t etch. The acid isn’t old, it has been cold in the basement so I warmed it a little before etching. Can acid just fizz out . It was really good a few weeks ago. I cleaned the pendant with alcohol and it sat in there for almost two hours.