Tanning and gas lamp: what they have in common

1. Step 1. Tanning — is a kind of — Chemical reaction. Chemical treatment of the proteins in hide.
2. Step 2. Chemical reaction — is used in — Aspirin. It is synthesized by acetylating salicylic acid.
3. Step 3. Aspirin — is made of — Coal. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
4. Step 4. Coal — is material for — Coal gas. The gas was made by the dry distillation of coal.
5. Step 5. Coal gas — is used in — Gas lamp. Coal gas.

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