Photochemical reaction and glasses: what they have in common

1. Step 1. Photochemical reaction — is used in — Silver halide. It is decomposed by light.
2. Step 2. Silver halide — is material for — Photographic film. The emulsion.
3. Step 3. Photographic film — is made of — Celluloid. The first flexible film was celluloid.
4. Step 4. Celluloid — is material for — Sunglasses. The frames are celluloid.
5. Step 5. Sunglasses — evolved from — Glasses. Glasses with dark lenses.

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