In fact, the sensitivity of luminol reagent itself is very high, even if the blood has been scrubbed, or even old blood stains, it can make luminol reagent glow. However, due to the principle that luminol is oxidized and glows, it is more likely to be affected by other non blood substances, such as bleach. In addition, trace blood in the excreta will also be detected by it, which will cause interference.
Some criminal investigation enthusiasts have found that the detection of blood with luminol reagent can be interfered with basically, such as scattering animal blood or liver, feces, iron ion reagent, etc., but it can't escape completely. Even if it can disappear in a short time, it will be exposed in a long time. And even if lucky enough to escape luminol, there are other ways and DNA extraction. Therefore, like the queen, to escape the police search by cleaning the floor, we can not deny the sensitivity of luminol reagent, but only minimize the emergence of evidence.
Because luminol luminescence is caused by oxidation, this means that there are many oxides and catalytic metals that can also make luminol glow, including the daily use of hypochlorite bleach.
If the suspect takes some measures after committing a crime, for example, if he uses chloric acid bleach to clean the scene, then if he is injected with luminol at the scene of the chlorite washed, you will find that it will shine everywhere, which will interfere with the detection of blood. You can't help but sigh that the reagent is wrong.
Luminol is not as bad as you think. Forensic criminal investigation using it to solve a case must have thought of this earlier than you. You should know that although luminol and hypochlorous acid can make luminol glow, the two kinds of luminous phenomena are not the same. The luminescence caused by bleaching agent is fast flashing, while that caused by blood stains is gradually emerging. Experienced detectives or police officers can usually tell the difference between the two, so it's impossible to beat them with such a small trick.
Luminol, a chemiluminescent reagent developed by Desheng, has many advantages, such as high quantum yield, easy synthesis, good water solubility and so on. If you are also a criminal investigation enthusiast, you can contact our website customer service for consultation and purchase if you want to guide and perform a chemiluminescence experiment.
Contact Person: Miss. Ankiwang