Visible theft detection powder is a starting gun. You have about 40 seconds.

Visible theft detection powder is a brightly colored, slow-to-wash dye (typically fluorescent magenta, orange, or electric green) that transfers to hands and clothing on contact and stays visible in normal room light for hours to days. You do not need a UV flashlight to see it. Products in this category include SmartWater visible stains, Redweb/Redwebb dye-based stains, ForensiKit visible marker powder, banker dye packs, SpySite visible theft powder, and generic fluorescent security dye powders. The advantage over UV powder is immediate identification. The disadvantage, and the subject of this guide, is that the thief sees the stain too, which starts a countdown the moment they notice it.

In field reports from mailroom and tool-crib deployments, the typical interval between a thief first touching a brightly stained item and realizing they have transferred the color to their hand is roughly 15 to 45 seconds. Once noticed, the thief does not dwell. They bolt, they wipe frantically on their clothing, they drop the item back and try to leave unnoticed, or in a minority of cases they try to wash their hands on site. The useful upper bound for live intervention is around 40 seconds of dwell after contact. Past that, the stain is on the pants, the item is on the floor, and the evidence is already fragmenting. This is the window visible powder alone cannot help you with, because by the time someone reviews footage or checks the camera the next morning, the thief is three scenes downstream.

Cyrano emits event.class = pre_action_zone_entry on the first frame a person's centroid crosses INTO the drawn polygon around the treated surface. Not on exit, not on dwell-timeout, on entry. That means the alert lands in WhatsApp with a tile thumbnail, zone name, and ISO timestamp before the thief has even touched the powder in most cases, and always before they have noticed the stain. Capture-to-WhatsApp latency is typically 5 to 15 seconds. Compare that to the 15 to 45 second stain-noticing window, and you have a usable intervention gap. During that gap, a front-desk attendant, a patrol officer, or a remote monitoring agent still has time to address, talk down, or dispatch while the stain, the hand, and the item are all in the same room.

It solves identification in a hypothetical future where the suspect is still in the building 15 minutes later. In practice, people who steal from mailrooms, tool cribs, and cash drawers leave quickly, and a visible stain accelerates the exit. You end up with powder on a pair of pants that is now three blocks away, unidentifiable on camera review because the person was in the room for 19 seconds and your recorder missed them. The powder is the ID tool. Getting your eyes on the tinted hand before the person leaves the building is a scheduling problem, and that scheduling problem is solved by a pre-action alert, not by more powder.

Yes, and this is increasingly common on multi-stage applications. Apply visible powder where the deterrence value is high and noticing-is-fine (mailroom inner shelf, obviously treated-looking copper racks). Apply UV-only powder where you want passive long-window evidence (keyed cash drawers, after-hours access to a treated panel). The zone entry event pairs with both. The visible powder flips the situation into a live intervention problem within the first minute. The UV powder remains as a forensic backstop for the cases that do get to the police report.

No. Cyrano's capture point is the DVR or NVR's HDMI multiview output, the same signal that drives your existing guard monitor. That composite already has every camera on the recorder mosaiced into tiles. One HDMI tap gives inference access to every feed at once. Works on analog cameras, IP cameras, any DVR brand including Hikvision, Dahua, Lorex, Amcrest, Reolink, Uniview, Swann, Night Owl, Q-See, and their rebrands. Install on a running DVR is under 2 minutes: HDMI in, HDMI out to the monitor, network, power. Up to 25 tiles per unit. You do not touch camera firmware, you do not negotiate ONVIF, you do not coordinate credentials.

Every zone entry event includes event.class (pre_action_zone_entry), property identifier, tile.label (camera name), zone name, entry_edge (which polygon edge was crossed, which tells you the approach direction), dwell_seconds so far at the moment of emission (often 1 or 2 when the alert is pre-contact), ISO 8601 timestamp with timezone offset to the second, a tile thumbnail URL (480x270 crop centered on the person), overlay_mask identifier (which DVR overlays were masked before inference, typically the clock, the camera name strip, and the channel bug), delivery channel (WhatsApp group), and latency_ms (capture-to-delivery). For a visible powder pairing, the entry_edge and the small dwell_seconds are the two fields that matter most, because together they prove the alert fired before the thief had any chance to react to the stain.

Mailrooms and parcel lockers with recurring after-hours theft. Tool cribs and gang boxes on active jobsites. Cash drawers with shift-change skim problems. Transformer cages and HVAC condenser pads. Any setting where a small number of treated surfaces are touched by a small number of legitimate users inside defined hours, and where the current loss pattern is a recurring low-dollar theft nobody is closing. Visible powder alone gives you a stain to look at the next morning. Pairing it with a pre-action zone entry event turns the next-morning problem into a tonight problem, and a tonight problem is the only kind a patrol officer or front desk can actually resolve.

The zone is drawn tightly around the treated surface. The dwell threshold for emission can be set to 0 seconds (fire on entry) or a short integer number of seconds for noisier scenes. The overlay_mask field records which DVR layout overlays were masked before inference so there is no ambiguity about the model triggering on a baked-in clock pixel. In practice, properties run an arming window (for example 19:00 to 06:00 on a mailroom shelf, or shift-change windows on a cash drawer) so the zone only emits during hours the treated surface should be empty. Combined, the precision is high enough that a WhatsApp alert is the right place to land, not a ticketing queue.