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The markings remain invisible until examined under an ultraviolet light source.
May not work well on some white papers, recommended for use on colored paper.
This ultraviolet LED flashlight is perfect for examining objects or anythings else for ultraviolet marks.
** Battery Included
For example, an article can be marked so that it is invisible to the eye, but under ultraviolet light the item and anyone who touched it can be identified. Powder,...
After the protected item comes in contact with the skin, the body's acids react with the powder, creating a highly visible purple stain which can last up to several days.