The dye is naturally rinsed out of the eye by tears.
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After exposure, the catalyst was rinsed out of the coating.
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Dr . Michael Spafford and his colleagues at Johns Hopkins University hope to change that by finding indicators of changes in the DNA of cells rinsed out of people's mouths.
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"If there's a message in the book, I think it's that snobbery becomes very close to being part of human nature, " he says, " but it's a part that, with care, we can rinse out of ourselves ."