Which labeling practice helps prevent cross-contamination when storing fuels?

• A. Rely solely on color codes for labeling.
• B. Keep labeling blank to speed operations.
• C. Clear labeling of each tank with fuel type.
• D. Label only after a transfer is complete.

Answer: (C)

Clear labeling of each tank with the fuel type lets everyone identify contents at a glance and prevents mixing the wrong product. When tanks are clearly labeled, you can verify before any transfer or use that you’re handling the correct fuel, reducing the risk of cross‑contamination between different fuels or grades. Relying on color codes isn’t enough because colors can fade, be misread, or vary between sites, which can still lead to mistakes. Leaving labeling blank or adding labels only after a transfer is complete allows products to be misidentified during the operation, creating opportunities for contamination. So, explicit, legible labeling of each tank with its fuel type (and grade as needed) is the most reliable practice to keep fuels from contaminating each other.