Hello - I’m pretty new to all this and I have a real old set of buck bros chisels. I became obsessed with flattening the backs. It took forever to do about 2 inches from the tips. Again I didn’t really know what I was doing besides using sandpaper on a granite block. Needless to say I was pretty aggressive and I created a very gentle slope or ridge on the chisel back. If I run my finger tips along the back I can feel where I stopped abrading the chisel back (like a little bump or step up) at the 2” mark.

Did I ruin these chisels?