Cast Iron Skillet Seasoning

I inherited a cast iron skillet from my grandmother. The seasoning on it is so built up from decades of cooking that the surface is smoother and more nonstick than any coated pan I've ever used. Dark layer is polymerized oil bonded to the iron at a molecular level. Each time you cook with fat and heat, you add another microscopic coat that strengthens the surface. The pan rewards use instead of degrading over time. Most kitchen tools start losing quality the moment you buy them. This one gets better. At about 8 pounds, the heft transfers heat evenly unlike thin pans match. My grandmother cooked eggs in it every morning for 30 years. The pan remembers that history in its surface. Care instructions are counterintuitive: no soap, no dishwasher, just hot water and a stiff brush. Specificity makes it feel like maintaining a relationship rather than cleaning a tool. Food releases differently from a well-seasoned cast iron than from a nonstick pan. The seasoning layer is organic and uneven in a way that actually works better.