How to Identify and Confirm the Presence of a Fluorescent Agent in a Mask
I tested several masks this afternoon, and I believe that two of them contain fluorescent agents, which were intentionally added. There are also some children’s shoes that may contain other ingredients that could cause a fluorescent reaction. The question is: how can we be sure that the fluorescence was deliberately added?
This is not a difficult question to answer. Let’s perform a cross-check test.
Equipment needed: A Shanghai Jiapeng three-in-one UV analyzer.
Known information:
One of the suspected mask ingredients includes:
1. Water
2. Curacao Aloe Gel
3. Soy extract
4. Witch hazel extract
5. Sodium lactate
6. Panthenol
7. Xanthan gum
8. Tocopherol (Vitamin E)
9. Diimidazolidinyl urea
10. Ureocapsule
11. Flavor
Additional knowledge:
(1) Another mask with similar ingredients showed no fluorescence. Its ingredients include:
1. Water
2. Curacao Aloe Gel
3. Soy extract
4. Witch hazel extract
(2) Another product containing these components also showed no ultraviolet fluorescence. Testing each component separately also did not result in any fluorescence:
5. Sodium lactate
6. Panthenol
7. Xanthan gum
8. Tocopherol (Vitamin E)
9. Diimidazolidinyl urea
10. Ureocapsule
(3) All the tested products (not just masks, but also many skincare items) contained fragrance, but only two showed fluorescence. This suggests that the presence of fluorescence is unlikely due to the natural properties of the listed ingredients.
Further testing:
(4) I applied the mask liquid onto a filter paper that had no fluorescent reaction. After drying, the area where the liquid was applied appeared white. When illuminated by the Jiapeng UV analyzer, it showed a strong fluorescent reaction.
[Image: A photo showing the fluorescent reaction on the filter paper]
(5) The brightness and color of the fluorescent area were similar to those of regular copy paper, which is known to contain fluorescent whitening agents.
[Image: A comparison between the mask’s fluorescent area and copy paper]
In summary, the fluorescence observed in the mask is not due to the natural fluorescence of its ingredients, but rather from an intentionally added fluorescent whitening agent. This is used to create a quick “rejuvenating†or whitening effect, potentially misleading consumers.
Update: After publishing this post, I received several questions. Some people pointed out that normal ingredients might also fluoresce, and that individual components should be tested for accuracy. Others suggested that the filter paper itself might have been contaminated.
With the help of others, I obtained the raw materials and base of the mask. I conducted another monomer test on August 28, and the results are as follows:
[Image: Results of the monomer test showing no fluorescence in individual components]
Based on this, I am more confident that the fluorescence was indeed due to a deliberately added fluorescent agent.
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