Hackaday9 年
aluminum ammonium sulfate
It turns out that a hot solution of alum (ammonium aluminum sulfate), which is available in the spice rack of your local supermarket, will dissolve the steel drill bit without reacting with the brass.
Hackaday9 年
Dissolve Steel Drill Bits In Alum From The Grocery
It turns out that a hot solution of alum (ammonium aluminum sulfate), which is available in the spice rack of your local supermarket, will dissolve the steel drill bit without reacting with the brass.