Okay kiddo, so let me explain oxidation and then talk about ley oxidation. You know how when you leave an apple out in the open, it starts turning brown? That's because of oxidation. When things are exposed to air, they can react with oxygen in the air and cause changes in their chemical makeup.
Now, ley oxidation is a kind of oxidation that happens to a special kind of water called "ley water." Ley water is made by mixing wood ash with water. When you mix wood ash with water, it creates a liquid that has a bunch of different minerals in it.
Ley oxidation happens when you expose something to ley water. When things are exposed to ley water, they can react with the minerals in the water and undergo a chemical change. This reaction can sometimes be helpful, like when ley water is used to soften water for washing clothes. But sometimes it can be harmful, like when ley water is used to change the color of fabric (because it can weaken the fabric fibers over time).
So basically, ley oxidation is like oxidation, but it happens because of a special kind of water called ley water.