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The blue is artificial ultramarine combined with titanium white.

In training, Taniguchi’s shirt glows titanium white.

Asked what they’d do without titanium white, Pete Cole, president of the paint manufacturer Gamblin Artists Colors in Portland, Ore., said, “Our Earth would cease to rotate.”

Golden Artist Colors, a paint company in New York, noted the dearth of titanium white could limit the production of mixed blue paints, such as light phthalo blue and light ultramarine.

A shortage of titanium dioxide, the pigment for titanium white and a fundamental ingredient in about a third of artist paints, also puts other colors at risk.