Dye and bellows: what they have in common

1. Step 1. Dye — includes — Synthetic dye. A dye.
2. Step 2. Synthetic dye — is made of — Coal. Aniline from coal tar.
3. Step 3. Coal — is material for — Coke. Coke is baked coal.
4. Step 4. Coke — is used in — Blast furnace. The fuel and reducing agent is coke (formerly charcoal).
5. Step 5. Blast furnace — has part — Bellows. Air was blown in by bellows, later by blowers.

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