Spectra — Caps
Hydrogen — Spectra Cap
Four lines. The visible Balmer series — 410.2, 434.0, 486.1 and 656.3 nanometres — the wavelengths hydrogen gives off as its electron drops to the second energy level.
What you're wearing
The red line at 656.3 is the one that makes nebulae photograph pink.
Materials & fit
Made to order — see the product photos for material and finish details.
Shipping & production
Made to order. Pressed and shipped in the US, with delivery time added on top depending on your destination.
US standard shipping runs $4.75–$7.98 depending on weight and destination — the exact rate is shown at checkout before you pay.
Each piece is made to order, so we can’t accept returns for a change of mind or the wrong size — please check the size guide first.
If an item arrives damaged or misprinted, contact us through the contact form within 30 days of delivery with a photo and we’ll arrange a free reprint or refund — no need to send anything back.
Same idea, different object
