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…showed last 75 words of 482 total…week later. The most common tests involve dripping a material into rabbits' eyes or applying it to the shaved backs of rabbits or guinea pigs and studying the resulting irritation or damage. Restrained to the point of immobility, some rabbits break their backs fighting the restraints. Rabbits are used because they have a special membrane on their eyes that retains the chemicals. The report states this is necessary to test the irritancy of the substance.