Coal and needle: what they have in common

1. Step 1. Coal — is material for — Synthetic dye. Aniline from coal tar.
2. Step 2. Synthetic dye — evolved from — Indigo. Synthesizing natural dyes.
3. Step 3. Indigo — is used in — Jeans. Indigo.
4. Step 4. Jeans — is a kind of — Trousers. Trousers.
5. Step 5. Trousers — uses — Needle. Trousers were sewn with a needle.

Open Evothings