Recently, the mornings and evenings have become noticeably cooler, and on some days in Tokyo the temperature drops below 10°C. On such cold mornings, I have the urge to wash my face with hot water, but I don't want to use the heater, so I use a futon and blanket to help save electricity and sleep warmly, and the bathroom feels especially cold the next morning. When I wrote about face wash and soap before, I wrote that I use "lukewarm water," but I wondered again whether the "lukewarm water" that I feel on my fingertips and palms is okay? I looked into it.
When you google it, the first thing that comes up is the HACCP regulations for "hygiene management." When using knives in the kitchen or factory, you should "wash them with lukewarm water (about 40°C) to remove food residue." I won't go into detail about HACCP, but if you're interested, please visit the Ministry of Health, Labor and Welfare's page.
https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/shokuhin/haccp/index.html
It seemed like it was about 40 degrees Celsius.
I'm pretty sure that in textbooks for cosmetics certification exams, it says body temperature (around 36°C). This is what's known as "body temperature warm (kan)." And, to digress, an information site that lists the temperature of sake says, " Warm sake is often called 'atsukan', but warm sake does not equal atsukan. 'Atsukan' refers to sake that has been heated to around 50°C. There are also other expressions depending on the temperature, such as 40°C being 'nurukan' and 45°C being 'jokan', and the word 'kanzake' is used to refer to all warm sake."
Well, well.
I read several blogs written by beauty researchers, beauty advisors, and people with Level 1 cosmetic certification.
The optimum temperature for washing your face is "32℃ to 36℃". Exactly! Some people have written "32℃" down , and some cosmetic manufacturers have even conducted experiments on this, so we looked at the results.
In other words, it was written that "cold water" makes it difficult to remove dirt such as sebum, and hot water removes even the necessary sebum and dissolves ceramide. And it seems that both cold water and hot water are too irritating for people who have a tendency to get razor burn.
By the way, when I asked my 80-year-old mother, who is an active hairdresser, she said, "It's just a little warm!" (living in Osaka). "But I adjust the temperature of the shampoo water depending on the season, and I observe whether the customer feels comfortable or not." "It's no good just asking, 'Is it hot?' Most customers answer, 'Yes.'"
I can't measure the water temperature in the bathroom every morning, and when I use the shower temperature setting, I tend to set it to 40°C or a little higher, so I control the bathroom faucet by moving my hand. I feel like the right temperature is one that feels neither too hot nor too cold.
Now that the weather is getting colder, or rather the dry season, when razor burn and dry skin are becoming more and more common, after washing your face, moisturize with an all-in-one gel to keep your skin supple and healthy, whether you're a man or a woman!