Laser engraving — the high-resolution substrate remover
Laser engraving removes a thin layer of substrate to expose a contrasting colour beneath the surface. On anodised aluminium the contrast is bright silver against the coloured anodised layer; on stainless steel the mark is dark oxidation against the polished steel; on oak the mark is dark grain against the surrounding wood; on glass and crystal the mark is a frosted micro-fracture. Resolution is the highest of any method on this list, and a tuned laser will hold fine type down to roughly 1 millimetre cap height and clean line work at hairline weights that no other method on hard goods can reproduce. Depth is shallow — typically 0.05 to 0.3 millimetres depending on the substrate — and a deep recess into the substrate is not what the laser does; that requires rotary. Colour is not added; the contrast comes from the substrate itself, so a coloured logo cannot be produced by laser on raw metal without a separate print step. MOQ is the lowest of any method here, because there is no physical tooling and setup is a focus-and-go. Typical lead time is five to ten working days for a 100 to 500-unit run, with the laser time per unit depending on artwork density rather than on quantity.