Chemical conversion coating solution, method for coloring metal element, metal element, and slide fastener

A chemical conversion coating solution for a metal element of a slide fastener, the chemical conversion coating solution comprising 1.0 to 5.0 g/L of SeO2, 0.08 to 0.78 g/L of CuCl2, 1 to 11 g/L of H2SO4, and 1.0 to 10.0 g/L of Na2S2O8.

A chemical conversion coating solution for a metal element of a slide fastener, the chemical conversion coating solution comprising 2.0 to 4.0 g/L of SeO2, 0.31 to 0.63 g/L of CuCl2, 8 to 11 g/L of H2SO4, and 2.0 to 8.0 g/L of Na2S2O8.

A metal element of a slide fastener with a colored coating, satisfying the following Condition 1 when a line analysis using energy dispersive X-ray spectroscopy is performed from an outermost surface of the metal element in a depth direction,

• Condition 1:
• for a metallic element with a highest concentration that constitutes a base material of the metal element of the slide fastener, assuming an average intensity in a depth range of 2,000 to 3,000 μm from the outermost surface is IM, a depth position the closest to the outermost surface where an intensity of the metallic element is 0.4IM is D1, and a depth position the closest to the outermost surface where the intensity of the metallic element is 0.7×IM is D2, then Se, O, Sn, Cu, and Cl are detected in a depth range from D1 to D2.