OpticzTM Single Door Pro Kit This is that hard to find UV Blacklight Reactive Invisible Ink for hand stamps, box marking, wall decorations, and other unique security applications.  Only visible under black light.  Will not wash off easy like other brands, but can be removed with effort. Great for document marking. Glows bright BLUE under blacklight. Kit Includes: One (1) 8 ounce bottle Blue Invisible Ink One (1) 14 UV LED Blacklight Flashlight One (1) Stamp Pad One (1) Rubber Peg Stamp Best viewed in dark or shaded area. Normal light (sunlight or white light) can make the effect less obvious to visually detect. Opticz Blacklight Reactive Inks are suited for use on skin, fabric and similar porous or textured surfaces. Please note that the effect is most intense after several minutes as the ink soaks into and dries on the skin. Normal Color: Invisible/Colorless UV Blacklight Activated color: Bright Blue Waterproof Simple to use - inks come ready made Won't gum up - stamp pads stay cleaner longer Economical - small amounts of ink are used with stamp pads All inks are formulated to fluoresce brightly under longwave ultraviolet lamps Readmittance type inks are designed for use at amusement parks, social gatherings and sporting events Inks are non-toxic, fast-drying and non-transferable This ink can be used for textile marking, hand-stamping, and fabrics. Ink has an alcohol base for quick drying. IMPORTANT SHIPPING & DELIVERY NOTES: This item contains a flammable liquid or aerosol (ORM-D Consumer Commodity or Limited Quantity) which cannot be shipped via airplane. Standard surface mail delivery may take up to 10 business days to be delivered. If needed by a certain date, choose an expedited service or contact us to upgrade to UPS Ground shipping for a guaranteed delivery date. Express shipment by Air is not available as dictated by US & International law.UltraViolet Distributing