Sirchie Fluorescent Invisible Skin Marking Ink (Pass In-Pass Out) 32 oz UV743EL

Overview of the Sirchie Fluorescent Invisible Skin Marking Ink invisible skin marking ink | UV743EL

Invisible marking for access control and investigative workflows

Sirchie Fluorescent Invisible Skin Marking Ink is an invisible skin marking ink used for pass-in/pass-out control and investigative tagging. The UV743EL formula can be swabbed, dabbed, or stamped on the skin. It dries immediately with no visible trace, then fluoresces a brilliant blue-white under long-wave ultraviolet light. The bottle shown is a 32 fl oz (946 ml) liquid container, clearly labeled UV743EL for quick identification in storage or evidence rooms. 

Facilities use this ink to control access and egress at prisons, detention houses, and other controlled areas. Staff apply a discreet mark at entry and verify it later under UV light at exits or checkpoints. Investigators also use fluorescent marking substances like this to help establish a logical association between a suspect, an object, and a location when standard visual inspection is not effective.

Dates, times, and symbols can be changed easily by combining the ink with stamps and stamp pads. This flexibility supports repeat use across shifts, events, and investigations without changing materials or procedures.

Key Features

• Application methods: Can be swabbed, dabbed, or stamped directly on skin.

• Drying performance: Dries immediately with no visible trace under normal lighting.

• UV response: Fluoresces a brilliant blue white when exposed to longwave UV light.

• Capacity: 32 fl oz 946 ml liquid volume.

• Investigative utility: Supports tagging and tracing techniques used to link a suspect, object, and location through fluorescent transfer verified under UV light.

• Examination process: UV examination typically requires a suitable ultraviolet light and a darkened room to observe fluorescence accurately.

• Safety guidance: Review the Sirchie Safety Data Sheet before use and wear protective gloves and clothing during handling.
  
  

Compatibility

Recommended environments and tools

UV743EL works with longwave ultraviolet lights used for inspection and examination. For investigative examinations, teams typically use a darkened room with adequate table space to spread clothing or items for inspection. Allow eyes to adapt to the dark before making final observations.

Important limitations

• Fluorescence is only visible under UV light.

• Results depend on proper lighting conditions and inspection technique.

• Follow facility policies for controlled use and documentation.
  

Intended Users

Designed for professional use

• Corrections and detention staff: Apply and verify discreet markings to manage controlled entry and exit.

• Law enforcement and security teams: Support access control and controlled movement at secure facilities and events.

• Forensic investigators: Use fluorescent tagging methods to support investigations involving theft, tampering, or repeated crimes.

• Evidence and examination personnel: Inspect hands, clothing, or materials under UV light and document fluorescent findings accurately.
  
  

What’s Included

• 1 x Sirchie Fluorescent Invisible Skin Marking Ink, 32 fl oz 946 ml, UV743EL

Not included: Ultraviolet light, stamps, stamp pads, protective gloves, or examination tools.

Why Buy from WCUniforms

WCUniforms is owned by a former law enforcement officer and EMT, and by USMC and USCG military veterans. We sell products we have used in the field. Most orders ship the same day, with a goal of shipping within 48 business hours for in stock items. We offer hassle free 30 day returns with some exceptions, SMS and email tracking updates for every order, and real human instant chat during business hours. Phone support is available at 855 452 4440.