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Our invisible inks fluoresce a brilliant blue or green when exposed to a long wave ultraviolet (UV) light source. This ink is nontransferable and will not irritate the subject’s skin. The ink can be applied to a subject’s hand using a rubber hand stamp or by means of a cotton-tipped applicator with which you can number or date the subject’s hand. Custom rubber hand stamps can be ordered with your organization’s name, logo, or whatever letters or numbers you require.