Iron — Spectra Long Sleeve

Iron writes a forest. Hundreds of lines crowd its spectrum; here, a reading across the visible band on a heavyweight black Gildan Ultra Cotton long sleeve.

Printed to scale at the wavelengths iron emits. Long sleeve, front placement, soft-hand finish.

Spectra reads matter by its light. The most lines of any common metal — the hardest fingerprint to forge.

Care is simple: cold wash, inside out, hang dry. We count durability in washes, not adjectives — and if anything about your order isn't right, email care@lunthra.com. A real person answers, and we make it right.

Buying it as a gift? If they're into physics, chemistry, or astronomy, they'll read it instantly — to everyone else it's simply a clean, well-made long sleeve.