Cellophane and barrel: what they have in common

1. Step 1. Cellophane — is made of — Cellulose. Cellulose.
2. Step 2. Cellulose — is material for — Nail polish. The film is formed by nitrocellulose: cellulose treated with nitric acid.
3. Step 3. Nail polish — uses — Dye. Pigments and dyes give the polish its colour.
4. Step 4. Dye — uses — Fermentation. Some dyes (indigo) were obtained by fermenting plants.
5. Step 5. Fermentation — is used in — Brewing. Yeast ferments the sugars of the malt.
6. Step 6. Brewing — uses — Barrel. Beer and wine were stored and transported in barrels.

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