All language subtitles for 3456-12

(We adhered to all the quarantine rules for filming)
Hello, this is Hyeji

Could you introduce yourself?

Hello, I'm Lee Eunkyung of P&K

What's the title today?

We'll do a study about foam cleansers

that we use every day

If you see the back of a cosmetic product,

it often tells you it's pH balancing
or something about its pH value

However, people might not know
well about pH

and the reason why

it focuses on pH so much

So we'll carry out an experiment today

That sounds helpful

The foam cleanser I'm using

says it's pH balancing

But it doesn't explain it well

What does pH mean?

Can you give me some basic concepts?

Basically,

in the chemical study,

pH is a quantitative measure of the acidity and alkalinity of materials

It's written in numbers between 0 to 14

If it's neutral
at standard temperature and pressure,

it's written as pH7

It's acid
if it's lower than pH7

And it's alkaline
if it's higher than pH7

The human body's pH index is

maintained as about 7.4

What's the process today?

We'll use pH balancing foam cleanser and normal foam cleanser

and compare pH index before and after

Skin pH and skin barrier have a close relationship

We're going to measure
transepidermal water loss

to evaluate skin barrier

Transepidermal water loss refers to

loss of moisture in the outer layer of the skin
in a certain amount of time

It's the amount measured

It's often called TEWL

What's the device we're using today?

We'll use a 'pH meter'
for measuring skin pH index

and 'Tewameter' for measuring TEWL

pH meter literally measures

skin pH index

The reference electrode and indicator electrode
are placed on a single glass electrode

We can check the skin pH index using it

Tewameter is used to measure skin TEWL

In tewameter probe head's cylinder,

there are two sensors
that measure temperature and moist

They indirectly measure evaporation, density, and slope of the water

and calculates evaporation speed

Then now is the time

to wash off my makeup

(Number one skin clinical test organization)

(The first listed clinical test organization in Korea)

(The first clinical test organization established by a doctor)

#1. Cleansing

Wait for 30 minutes after removing the makeup

#2. Measure 'Before'

Measure TEWL and pH before using the product

#3. Cleansing

Wash the right side with pH balancing foam cleanser
and left side with normal foam cleanser

#4. Measure 'After'

Measure TEWL and pH after using the product

We've done the experiment

How's the result?

Let's check the most important pH index first

The part you used normal foam cleanser

had a pH of 6 before

And it was pH 6.56 after cleansing

pH level increased after cleansing

The part you used pH balancing foam cleanser

had a pH of 6.03 before

And it was pH 5.51 after cleansing

The skin maintained as subacid after cleansing

Let's also check the TEWL change

TEWL is a measure of water evaporation

The less it changes after cleansing,

the less damage to the skin barrier

When you washed your face with the normal cleanser,

TEWL changed by 13.740%

But when you washed your face with pH balancing cleanser,

TEWL changed by 3.242%

TEWL changed less

when you used the pH balancing cleanser

damaging your skin barrier less

So you mean the pH balancing cleanser I'm using

keeps water from evaporating
more than a normal cleanser

When you use a pH balancing foam cleanser,

since it damages the acid mantle less

resulting in maintaining pH level subacid

It damages the skin barrier less

compared to the normal cleanser

resulting in less increase in TEWL value

In conclusion,

pH balancing foam cleanser reduces skin barrier damage

and keeps a healthy pH level

It was so fun today

Please look forward to the next episode!