> On Oct 10, 2015, at 09:48 , Claudio DeLorenzi  wrote:
> 
>  Does anyone know if the edges of steel files are permanently damaged (or
> weakened) by soaking in acid?

Go read everything in the archives that George Langford
has written (not kidding; he knows this stuff):

http://swingl
eydev.com/archive/get.php?message_id=255300

http://swingleydev.com/archive/get.php?message_id=64253&submit_thread=1
">http://swingleydev.com/archive/get.php?message_id=64253&submit_thread=1

Adam
(who has stopped soaking steel tools in vinegar)