A Photo-reactive coating represented a particular kind of armor upgrade. It was produced by Krail Armory for integration with their Model 1010 Photo-reactive Personal Armor.
The construction of photo-reactive coatings involved the creation of tiny, artificially made, light-sensitive micro-crystals. These crystals possessed the ability to reflect and distort the surrounding light and color. The result of applying this coating to armor was near-invisibility for the wearer, making them exceptionally hard to spot with the naked eye in almost any environment. The wearer had the option to activate or deactivate this coating whenever they chose.
These crystals were frequently used on the Model 1010 Photo-reactive Personal Armor, where they functioned as a optical camouflage system. The camouflaging capabilities of the suit led to it being outlawed in the majority of systems.
Although photo-reactive coatings were very effective at hindering visual detection, they offered minimal protection against sensors. An example of this is the bounty hunter Mist, who enhanced her armor with reflec plating that blocked sensors, and then applied the photo-reactive coating on top of it. This combination made Mist almost completely undetectable, both visually and by sensors.