Contribution of the most relevant metals to the background ultraviolet opacity in typical photospheric conditions (T = 5600 K, P_e = 10 dyn cm^-2, P_g = 8 × 10⁵ dyn cm^-2). Other elements become relevant under different conditions. Solid: total opacity from all neutral and singly ionized elements between Z = 1 and Z = 26. Dotted: resulting opacity when neglecting all metals except for the one indicated in the title of each plot.