Abstract: A titanium member includes a first region where a plurality of first convex structural bodies extending in a first direction are arranged on the surface of the titanium member in a second direction orthogonal to the first direction, the first convex structural body has first convex portions arranged on an upper surface of the first convex structural body at an interval of several hundred nanometers along the first direction, and a height of the first convex portion is several ten nanometers. It is preferable that the first convex structural bodies adjacent in the second direction are arranged at an interval wider than the interval at which the first convex portions are arranged, and in the first convex structural bodies, a height including the first convex portion is higher than the height of the first convex portion.

Abstract: To provide a decorative member having a cherry blossom pink color. A cherry blossom pink decorative member of the present invention includes a base and a decorative coating formed on the base, wherein the decorative coating is formed by layering an undercoat layer and a finishing layer from the base side, the undercoat layer is a carbonitride layer composed of a carbonitride of a metal containing Ti and at least one selected from Nb and Ta, and the finishing layer is a Au alloy layer composed of an alloy containing Au, a metal having a silver color, and Cu.

Abstract: To provide a decorative member having a cherry blossom pink color. A cherry blossom pink decorative member of the present invention includes a base and a decorative coating formed on the base, wherein the decorative coating is formed by layering an undercoat layer and a finishing layer from the base side, the undercoat layer is a carbonitride layer composed of a carbonitride of a metal containing Ti and at least one selected from Nb and Ta, and the finishing layer is a Au alloy layer composed of an alloy containing Au, a metal having a silver color, and Cu.

Abstract: A titanium member includes a first region where a plurality of first convex structural bodies extending in a first direction are arranged on the surface of the titanium member in a second direction orthogonal to the first direction, the first convex structural body has first convex portions arranged on an upper surface of the first convex structural body at an interval of several hundred nanometers along the first direction, and a height of the first convex portion is several ten nanometers. It is preferable that the first convex structural bodies adjacent in the second direction are arranged at an interval wider than the interval at which the first convex portions are arranged, and in the first convex structural bodies, a height including the first convex portion is higher than the height of the first convex portion.

Abstract: A black member includes a base and a black layer laminated on the base. The black layer contains titanium aluminum nitride, titanium silicon nitride, or titanium aluminum silicon nitride. The black layer may also contain at least one type of elements selected from the group consisting of oxygen, fluorine, and carbon. When the black layer contains carbon, and assuming that a total amount of elements contained in the black layer is 100 at %, the black layer contains carbon of 10 at % or less. In a color evaluation according to an L*, a*, b* color system (CIE color system), the black layer satisfies L*?48.0, ?2.0?a*?3.0, and ?3.5?b*?3.0.

Abstract: Provided is a hard decorative member excellent in scratch resistance. The hard decorative member according to the present invention includes a base and a hard decorative coating film layered on the base, in which the hard decorative coating film includes a gray-tone layer including a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with a non-metallic element including at least carbon. It is preferable that the amount of carbon contained in the gray-tone layer is 30 to 70 atm % in a total of Ti, the metal M2, and the non-metallic element of 100 atm %.

Abstract: Provided is a hard decorative member excellent in scratch resistance. The hard decorative member according to the present invention includes a base and a hard decorative coating film layered on the base, in which the hard decorative coating film includes a gray-tone layer including a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with a non-metallic element including at least carbon. It is preferable that the amount of carbon contained in the gray-tone layer is 30 to 70 atm % in a total of Ti, the metal M2, and the non-metallic element of 100 atm %.

Abstract: In order to provide a white hard decorative member being remarkably enhanced in scratch resistance and abrasion resistance and having a high-quality color impression, and furthermore supply a product capable of freely controlling the color tone, corrosion resistance performance, and etching performance, the white hard decorative member includes a base material having thereon an alloy adherence layer having a high adherence effect, an alloy gradient adherence layer in which the reaction gas content is gradually increased, an abrasion-resistant layer having high hardness, and an alloy color-up gradient layer in which the reaction gas content is gradually decreased, which are formed by using a film of an alloy combining a metal having a high adherence effect to a metal and high brightness, a metal having high film hardness and high corrosion resistance, and a metal for enhancing the corrosion performance.

Abstract: In order to provide a white hard decorative member being remarkably enhanced in scratch resistance and abrasion resistance and having a high-quality color impression, and furthermore supply a product capable of freely controlling the color tone, corrosion resistance performance, and etching performance, the white hard decorative member includes a base material having thereon an alloy adherence layer having a high adherence effect, an alloy gradient adherence layer in which the reaction gas content is gradually increased, an abrasion-resistant layer having high hardness, and an alloy color-up gradient layer in which the reaction gas content is gradually decreased, which are formed by using a film of an alloy combining a metal having a high adherence effect to a metal and high brightness, a metal having high film hardness and high corrosion resistance, and a metal for enhancing the corrosion performance.