Marker, method for manufacturing marker, and detection target

A marker comprising:

• a base material layer;
• a first layer that is laminated on an observation side of the base material layer, and is observed in a first color;
• and
• a second layer that is partially laminated on an observation side of the first layer, is observed in a second color different from the first color, and partially conceals the first layer,
• the first layer being observable in a region where the second layer is not laminated, and
• the second layer including a resist material.

A method for manufacturing a marker comprising:

• a first layer forming step of laminating a first layer including a resist material and to be observed in a first color on one surface of a base material layer including glass;
• a first exposure step of exposing the first layer to light;
• a first developing step of developing the first layer;
• a first baking step of baking the first layer,
• a second layer forming step of laminating a second layer including a resist material and to be observed in a second color on the first layer which has been stabilized;
• a second exposure step of exposing the second layer to light via a mark pattern;
• a second developing step of developing the second layer;
• and
• a second baking step of baking the second layer.

A plate-shaped marker for measurement of a position and/or a posture from a camera, comprising:

• a base material layer;
• a first layer that is laminated on an observation side of the base material layer, and is laminated on an entire surface of the base material layer and observed in a first color;
• and
• a second layer that is partially laminated on an observation side of the first layer, is observed in a second color different from the first color, and partially conceals the first layer,
• wherein the first layer is observable in a region where the second layer is not laminated, and
• the base material layer has a linear expansion coefficient of 10×10−6/° C. or less.