I am new to the knife making scene. I have gotten a piece of 1/8" x 1 1/2" metal at Lowe's to do my first blade so I am not sure what exactly it is. I have cut the design out of the metal & after I file it down I am gonna heat it in a charcoal bucket until a magnet does not stick to it. I am sure it will be red hot. Here is my question what do I need to quench it in?? olive oil?? motor oil?? used motor oil??