Krypton — Spectra Tee

One krypton line once defined the metre. From 1960 to 1983, a length of 1,650,763.73 wavelengths of its orange-red 605.78 nanometre emission was the international standard, before light itself replaced it.

Printed to scale on black cotton, the wavelengths hold their true positions, each rendered in the colour it emits. Front placement, soft-hand finish.

Spectra reads matter by its light. Krypton is a noble gas, inert and colourless until it's made to glow and briefly, the ruler by which the world measured itself.