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Three days at the pool. Day 1: frame catches light the way it did on unboxing. Day 3: those same edges carry micro-scratches that weren't there at check-in. No drops. No accidents. Nothing that would explain the condition. Just the phone set down and picked up across three days of normal resort use. Here's the material science behind what the right panel shows. Pool deck concrete registers 6–8 on the Mohs hardness scale — the universal measure for scratch resistance. iPhone aluminum frames register 2.5. When a material rated 2.5 contacts a surface rated 6–8, the softer material loses material on every contact. No exceptions. This is not a product defect. It is a hardness differential that physics resolves the same way, every time. The anodization layer covering that aluminum frame is 5–25 microns thick — thinner than a human hair (70–100 microns). That layer is the frame's color, texture, and finish. Once scratched, it cannot be restored. Re-anodization requires complete phone disassembly and color-matched electrochemical reprocessing — not feasible on any modern integrated device. The raw aluminum underneath is permanently exposed. Across three days of normal resort use — setting the phone on the ledge, picking it up, placing it poolside — the estimated contact count between frame edge and pool deck concrete is approximately 60 events. Each contact transfers microscopic material from the softer substrate to the harder surface. Each transfer is irreversible. The right panel is the accumulated result. 'Hala, ganito na pala' — that reaction, on the drive home, isn't carelessness. It's physics operating exactly as the Mohs scale predicts. At the point of resale or trade-in, this surface condition reduces assessed value independently of screen and battery health. Frame condition is the first visible indicator. It is assessed before anything else. Full material science documentation — including the 5-stage damage progression, skin oil acceleration data, and why anodization repair is not commercially available — is at the link.