Archived posting to the Leica Users Group, 2000/04/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Joe Codispoti wrote: > There is a German word that has haunted me for many years. I hope someone > among the many on this list who speak German will be able to help. > > In certain types of cameras, mainly older Zeiss, at times there are "bumps" > visible on the surface of the leatherette. > These protrusions are caused by corrosion of the underlying screw head. The > corrosion grows over time. > I recall many years ago someone calling this phnomenon "grün....something", > a word that I think meant "copper or brass oxide". > Can someone complete the word in question? > Thanks in advance. > > Joseph Codispoti Joseph, the correct word is "Gruenspan" (I don't have the u umlaut in my keyboard, I have to use ue) It is in english: "Patina" The copper oxidizes and the oxide coating turns this colour. It is often seen on copper church roofs. It can also be seen on brass, because of the copper content. But to a lesser extend. It always shows up on my nose pads of my glasses. I think the sweat does it. Regards, Horst Schmidt