#332Anodized Titanium

An anodized titanium surface glazed in thin-film iridescence. A field of flowing sine layers stands in for the oxide-film thickness; its value drives a hue that sweeps a purple→blue→gold→purple ring, blended in Oklab so the colour bands stay perceptually even. The same layers give an analytic surface normal that undulates a cool metallic reflection (an inline studio matcap), and a fresnel term ties the iridescence to the curvature so it flares along the ridges. The bands advect on their own; scroll rotates the flow, the pointer drops a spreading ripple, and a press turns up the saturation like raising the anodizing voltage. Luminance is capped so the colour never blooms out.