Sulfonamides and personal computer: what they have in common

1. Step 1. Sulfonamides — evolved from — Synthetic dye. Prontosil was a red dye.
2. Step 2. Synthetic dye — is made of — Coal. Aniline from coal tar.
3. Step 3. Coal — is a kind of — Carbon. Mostly carbon.
4. Step 4. Carbon — is material for — Laser printer. Toner is carbon black in resin.
5. Step 5. Laser printer — is used in — Desktop publishing. Output to a laser printer.
6. Step 6. Desktop publishing — uses — Personal computer. Page layout on a PC.

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