Which label panel contains the directive 'Read the label before using'?

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The directive should appear on the principal label panel because that panel is the primary source of essential use instructions and safety information seen first before handling or applying the product. It’s the part of the label most users check initially, so placing “Read the label before using” there helps ensure the warning is noticed before any work with the product. The back panel typically holds more detailed information like PPE, storage, and disposal; the front panel is often focused on branding, and secondary label panels are supplementary. Putting the directive on the principal label panel minimizes the chance of bypassing important safety information.