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The chemistry and physics of textiles, food, and the surrounding area revealed the answer: The blue water that police sprayed on the protesters was thought to be “methylene blue”, compared to what Hong Kong authorities used ago. one year to go. Skin for 3-7 days.
Today (October 16, 2020), page: Chemistry, Physics, Textiles, Food and Environment Solve questions about blue water Where officials sprayed protesters at the Pathumwan intersection Bringing information that had been released on September 1 of 2019, who had posted a message to educate about blue water. In Hong Kong authorities to spray protesters Expresses the message that
According to the news on Saturday (08/31/2019), Hong Kong authorities have used a water-soluble blue dye and sprayed it on protesters. To confirm the identity of the protesters, the alleged evidence can be attached at least 3-7 days from this link.
I saw the water soluble blue color (blue), but the paint that was adhered to the skin that was greenish blue on the protesters’ body The ad expected the color to be “Methylene Blue” or Azure A, B, C color or maybe “Thionine” (Lauth’s violet).
Stick color for 7 days
For all the colors in this series They are dyes that have a structure and the color is positively charged thiazine. Which can stick to protein material Both human skin Bacteria Including silk and wool also Even at room temperature
When Hong Kong authorities used to dissolve water to spray protesters. I was able to make the color sticky on the skin for a period of 3-7 days.
According to the intensity and scrubbing ability of the person who was injected with these paints (According to the age of the dandruff and the epidermis of the stained person)
Many people would doubt that And the colors of this group will not be interrupted at all? These paints have a very strong cationic condition that can adhere to negatively charged materials even with grease. Including forming an ionic bond with the protein “carboxylate” (Carboxylate: -COO⁻) group is very good. Therefore, rinsing with regular detergents is almost impossible unless the dandruff or cuticle is completely scrubbed away. Which is almost impossible (if anyone has ever done Gram stain or biological stain with these colors I will greatly appreciate the difficulty of exfoliation.) Although these colors can be reduced With glucose in base state until “the color disappears”
But when left in the oxygenated atmosphere for a while the color will turn out to clearly show the blue smile anyway (try the search keyword “blue bottle experiment”, see) and this group of colors are resistant to oxidizing bleach such as chlorine bleach. And the bleach peroxide is very good, that is, just wait for the time to pass until the exfoliation occurs.
Many people still wonder if this group of colors, when leaked into the environment, will cause pollution or not.
The colors in this group have very low lightfastness, so call it only a month when the sun is quite intense. The color was lost a lot. (So it is not popular to use as a fabric dye unless it is dyed on acrylic fibers that will last as long as possible) and even in the dissolved state, the color will break down very quickly. And it can also be absorbed very easily by absorbent material.
However, this group of pigments is capable of eliminating many types of microorganisms. It can provoke the balance of local microorganisms that nature can change And with this group of colors it has the properties of killing microbes. Therefore, it is commonly used to treat “Helminth disease” Ik “fish (Ichthyopthirius sp.)” It’s good !! But the Hong Kong authorities must have supported the direct and indirect effects of the use of these colored watercolors on the protesters. (That adding will only ask for scientific information But let me overlook the social and political issues)
Additional note: many of you seem to be. The “malachite green” (malachite green) giving the blue green (teal green) is possible because malachite green is also a cationic dye and has properties like biological staining. Only there is a section structure for the color. Triarylmethane. Here, add, I’d like to make another guess as well. “
From the news of last Saturday (08/31/2019) … published by Chemistry, Textile Physics, Food and Surroundings on Saturday, August 31, 2019.
https://www.youtube.com/watch?v=wspwHXnWjMs
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