--- product_id: 34183223 title: "Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue" brand: "opticz" price: "£0.21" currency: GBP in_stock: true reviews_count: 8 url: https://www.desertcart.co.uk/products/34183223-opticz-uv-blacklight-reactive-large-tip-invisible-ink-marker-blue store_origin: GB region: United Kingdom --- # Double ink volume for extended use Bright blue UV glow under blacklight 1.5mm broad tip for bold invisible marks Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue **Brand:** opticz **Price:** £0.21 **Availability:** ✅ In Stock ## Summary > 🔦 Unlock the unseen with every stroke — glow where others can’t! ## Quick Answers - **What is this?** Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue by opticz - **How much does it cost?** £0.21 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/34183223-opticz-uv-blacklight-reactive-large-tip-invisible-ink-marker-blue) ## Best For - opticz enthusiasts ## Why This Product - Trusted opticz brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Safe & Skin-Friendly:** Formulated for safe use on skin, enabling invisible body art that glows brilliantly at events and parties. - • **Fast-Drying & Semi-Permanent:** Quick-dry ink resists smudging and removal, ensuring your markings stay secure and visible only under UV light. - • **Twice the Ink, Twice the Value:** Generous ink supply means longer-lasting use without constant replacements—ideal for professionals and creatives alike. - • **Extra Large Tip, Extra Bold Impact:** 1.5mm broad tip delivers thick, clear invisible lines perfect for security marking or creative projects. - • **Invisible by Day, Glowing by Night:** Write secret messages or create stunning UV-reactive art that only reveals itself under blacklight. ## Overview The Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker in blue features a broad 1.5mm tip and double the ink volume of standard markers, delivering bold, invisible markings that glow bright blue under UV blacklight. Perfect for security, event marking, and creative UV body art, this fast-drying, semi-permanent ink is safe for skin and designed for professionals and creatives seeking a unique, high-impact tool. ## Description Product description This UV blacklight reactive invisible blue large tip marker uses our high quality water based invisible ink blend. Perfect for secret messages, marking merchandise, and other stealthy security uses. Glows an incredible bright blue in blacklight. Ideal for metal, glass, plastics or paper. Can also be used on aluminum, ABS, acrylic, rubber, cellulose, acetate, formica, nylon, polystyrene and polyethylene. Totally invisible and won't wash off easily. Large tip is ideal for covering larger areas with minimum passes. Marker comes ready to use and is formulated to fluoresce brightly under long wave ultraviolet or LED blacklight. Ink is non-toxic, fast-drying and non-transferable. Ideal for applying onto an already printed surface. Marker is non refillable. This classic Opticz Invisible Ink Marker applies totally invisible and will glow bright blue in UV light Opticz UV Inks have been an industry standard for 10+ years! This marker is suited for re-admittance at events, social gatherings, sporting events, glow parties, marking valuables or your own unique security applications where hidden detection is of benefit. Our inks are non-toxic when used properly, fast-drying and non-transferable. This ink can be used for textile marking, hand-stamping, and fabrics as well. If using on skin, avoid application around sensitive areas like eyes and mouth. Key Features Water based blend is safe for skin when used properly. Ideal for secret messages or security marking. Invisible in normal light. Glows bright blue in blacklight. Large tip is ideal for covering larger surfaces areas with minimum passes. Marker measures 5.25" long x 1/2" wide Review: OPTICZ UV INVISABLE INK PEN - Great security uv pen and its a big pen with lots of ink works great, pay attention to tip size I believe this is 1.5 nib...nice quality and great value for ur buck I got the blue Review: Fun way to use. - Best black light invisible marker I’ve bought shows up so clean in the black light. Easy to use dried quickly very high-quality. The one I got glows blue in black light. Very good if you want to write an invisible note, secret letter or even write in your diary/journal. ## Features - Invisible/colorless in normal light. Glows bright blue in UV blacklight. Please note, these markers do NOT glow in the dark. You must have a blacklight to get the glow effects. - Extra large body with broad tip. Contains twice the ink as our standard sized markers! - Safe for use on skin. Use for security marking (such as admissions) or create amazing invisible body art designs that glow in blacklight! - These are the markers you want for semi permanent invisible marking. These markers can be used for: Event Tickets, Industrial Coding, Security Printing, Coupons, Raffle Tickets, Inventory Control, Advertising, and more! - Ink is fast drying and does not remove easily! Avoid sensitive area such as eyes, mouth, and nose ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01F6IPK00 | | Additional Features | glows bright blue in blacklight | | Age Range Description | 18+ | | Best Sellers Rank | #120,411 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #987 in Drawing Markers | | Body Shape | Cylindrical | | Brand | Opticz | | Brand Name | Opticz | | Color | Blue | | Customer Reviews | 4.4 out of 5 stars 1,183 Reviews | | Global Trade Identification Number | 00840015102531 | | Grip Type | Smooth | | Hand Orientation | Ambidextrous | | Ink Base | Alcohol | | Ink Color | Blue | | Is Waterproof | true | | Item Diameter | 0.5 Inches | | Item Dimensions | 5.25 x 0.5 x 0.5 inches | | Line Size | 3 Millimeters | | Manufacturer | DIRECTGLOW LLC | | Marker Type | Permanent Marker | | Material Type | Plastic | | Model Number | RSMARKB | | Number of Items | 1 | | Number of Pieces | 1 | | Pattern | Solid | | Point Type | Medium | | Recommended Uses For Product | Ultraviolet security, mark personal belongings, glow party, secret messages, drawing, UV art | | Style | Permanent | | Surface Recommendation | Textured surfaces yield the best results. | | Target Audience | Adult | | UPC | 840015102531 | | Unit Count | 1.0 Count | | Water Resistance Level | Water Resistant | | Writing Instrument Form | Marker Pen | ## Product Details - **Brand:** Opticz - **Ink Color:** Blue - **Number of Items:** 1 - **Point Type:** Medium - **Recommended Uses For Product:** Ultraviolet security, mark personal belongings, glow party, secret messages, drawing, UV art ## Images ![Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue - Image 1](https://m.media-amazon.com/images/I/51YhPUrxVSL.jpg) ![Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue - Image 2](https://m.media-amazon.com/images/I/613At-0K-dL.jpg) ## Questions & Answers **Q: The "product description" says the ink is permanent and solvent based. However "features & details" says water based. Which is correct?** A: Ok, I just double checked this. It is a 60% water based ink, but it is permanent and water does not remove it. We just verified with testing. **Q: How long does this last?** A: We bought it a year ago. With cap on, lasts. We just used it again ast week. As for what you've written, unless it suffers wear and tear, it lasts. Stuff penned last year still shows. **Q: Does it come with a uv light? Once you have written on paper or other surface how long does the message last?** A: No Uv light. Stays on paper or surface as long as you don't wash it off. **Q: Quiero solo ordenar un set de 3 y me están cobrando ppr 3 set** A: Agrege uno y luego cambie la cantidad. ## Customer Reviews ### ⭐⭐⭐⭐⭐ OPTICZ UV INVISABLE INK PEN *by P***Y on February 23, 2026* Great security uv pen and its a big pen with lots of ink works great, pay attention to tip size I believe this is 1.5 nib...nice quality and great value for ur buck I got the blue ### ⭐⭐⭐⭐⭐ Fun way to use. *by K***E on February 6, 2026* Best black light invisible marker I’ve bought shows up so clean in the black light. Easy to use dried quickly very high-quality. The one I got glows blue in black light. Very good if you want to write an invisible note, secret letter or even write in your diary/journal. ### ⭐⭐⭐⭐ Works ok, except on bright white paper *by M***I on August 19, 2019* Works ok, except on bright white paper, the brighteners in the paper (or other materials) mask the glow from this blue pen, use red on bright white paper, or other media. ## Frequently Bought Together - Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Blue - Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Red - Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Yellow --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/34183223-opticz-uv-blacklight-reactive-large-tip-invisible-ink-marker-blue](https://www.desertcart.co.uk/products/34183223-opticz-uv-blacklight-reactive-large-tip-invisible-ink-marker-blue) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-26*