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So how long will the highlighter ink last? I want to make a fluorescent mineral fountain for my Granddaughter for her birthday and hope I could send the water already done in a plastic sealed container would this work do you think? I am creating everything by hand so it will be unique only to her. Once she puts the water in the fountain will it just recycle and not lose its fluorescents? I am buying the blacklight to go with it.
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