Polarizing filter and zip: what they have in common

1. Step 1. Polarizing filter — is made of — Celluloid. Land’s Polaroid is aligned crystals in a film.
2. Step 2. Celluloid — works like — Nail polish. Both are nitrocellulose: celluloid is a solid plastic, the polish is a solution of it that dries into a film.
3. Step 3. Nail polish — uses — Dye. Pigments and dyes give the polish its colour.
4. Step 4. Dye — includes — Indigo. A dye.
5. Step 5. Indigo — is used in — Jeans. Indigo.
6. Step 6. Jeans — has part — Zip. A zip.

Open Evothings