What color will Lumino turn when encountering blood?
For most murder scenes, blood stain investigation steps are essential, but often the blood stains on the scene have been cleaned up in various ways, and the presence of blood stains is almost impossible to recognize with the naked eye. In this case, Luminol reagent may be needed to help.

Its characteristics determine its connection with the blood, as it is soluble in alkaline liquids and can undergo oxidation reactions with metal catalysts such as iron and copper. Once a reaction occurs, energy is generated and emitted in the form of photons, resulting in fluorescence.

1、 Lumino produces fluorescence color when encountering blood
Through the process of luminescence, it is clear that it is actually very similar to some luminescent organisms in nature, such as fireflies. In the series of reactions produced, metal catalysis plays an important role. The greater the degree of catalysis, the stronger the reaction becomes, and the brighter the fluorescence appears. When heme is present in the blood, iron acts as a catalyst, and once Luminol encounters it, it produces a bright blue light.

2、 The use and preparation of luminol reagents during the survey process
During the survey process, it was prepared using luminol, sodium carbonate, distilled water, and hydrogen peroxide. During use, it is important to ensure that the doors and windows on site are tightly closed, and that the lights are turned off to maintain darkness, in order to prevent other light sources from interfering with blood stains. Due to its high sensitivity and fast emission, it is also necessary to pay attention to the timing of on-site photography.

3、 Advantages of using Luminol reagent
1. High sensitivity
In general, in survey work, some blood stains have solidified for a long time, and some blood stains have been diluted after multiple washes, but can be displayed through it. Therefore, for some anti reconnaissance actions, such as blood coverage, it is completely impractical.
2. Non hazardous
Its configuration method is simple, easy to operate, and has strong stability. Long term contact with it during the investigation process is basically harmless.
3. Not affected by oxidants
Although some studies have found that bleaching powder and potassium permanganate oxidants have a certain interfering effect on them, this is not the case in practical applications. The light emitted by bleaching powder or potassium permanganate is fundamentally different from the light emitted by blood stains, which can be easily distinguished by surveyors at a glance, so it is basically not affected by some high oxidizing substances.

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