쉐도잉 연습: Invisible ink science experiment - 영상으로 영어 말하기 배우기

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Has your kid ever wanted to be a spy or maybe write secret coded notes to their siblings or their friends?

Well, today I have an experiment for exactly that called secret friendship notes.

Hi everyone, I'm Emily Calandrelli, MIT engineer and host of Emily's Wonder Lab.

And on my channel, we learn about all things space and science.

So grab some turmeric because we are about to go on a mission.

Keep exploring.

And this sounds like.

Skate carrier.

And keep exploring.

Today for our secret friendship notes, we are going to draw a secret message with a baking soda solution, set it aside to dry,

and then once it's dry, we are going to reveal it with a turmeric solution.

Okay?

So for our baking soda solution, what you need is one cup of water plus one tablespoon of baking soda.

To draw your message, you'll want a few paintbrushes, and then later for your turmeric solution,

you want one half cup water with one teaspoon of turmeric.

And parents and adults, if you've worked with turmeric before, you know that it stains everything.

Fingers and counters and bowls and basically anything it touches.

So please exercise caution here.

It is why I have my tinfoil on the counter because I'm trying to save this counter from the turmeric.

So just be careful here.

So first, we are going to make our baking soda solution.

This is going to be our paint that we paint the secret message

that you're not going to be able to see after it dries.

So let's go ahead and do one cup of water.

Right in a bowl.

And now, let's add one tablespoon of baking soda.

Just like this.

And then go ahead and mix it up.

You'll notice that the baking soda won't completely dissolve in the water, and that's okay.

If you have a little bit of baking soda on the bottom, that's all right.

We're just trying to create as much of a baking soda solution as we can

because it's the baking soda that is the very key ingredient to our secret message here.

Once you've mixed that up about as good as you can, we're going to take our paintbrush and use this

and our baking soda solution to write our secret message on a piece of computer paper.

So I'm going to take one sheet of computer paper here,

set this aside and write my message here trying to get as much baking soda on your paintbrush as you can.

Tap it off.

You don't want it to be too wet.

Okay, now that I've written my secret message, I'm going to set it aside to dry.

It'll take between 10 minutes to an hour, really depending on how much water you use on your paper.

But if you want this message to be completely secret,

You want it to be completely dry because once it's completely dry because the baking soda is white

It's so hard to see this is the secret part of these secret friendship notes

So try to let it completely dry before you move on to the next step

Once your secret friendship note is dry

You can give it to a friend with the magic reveal paint and the magic reveal paint is our turmeric solution

So let's go ahead and make that we're going to do one half cup water there plus plus one teaspoon turmeric.

I'm using my one half teaspoon here because it fits in the turmeric because I'm just trying to avoid spills here.

One half teaspoon plus, plus one half teaspoon equals one teaspoon.

I'm gonna go ahead and mix this up.

Again, it'll be a little clumpy.

This is because turmeric is not soluble in water.

It's soluble in alcohol, but we're just gonna do our best here.

We just wanna suspend the turmeric in the water as best we can.

Now here's the fun part.

So we're going to take our turmeric solution

and with a big paintbrush you're going to tell your friend

that to reveal the secret message they just need to paint the paper with the magic reveal paint.

You just want to go ahead and paint the entire thing.

I'm going to take my secret message here and I'm just going to paint on top of it.

Because look at this.

It's very hard to see what this says.

Right?

What is my secret note saying?

I don't know.

Let's reveal it.

Here we go.

Look at that.

Look at the turmeric reacting with our baking soda here.

Do you see what's happening?

Look at this.

Everywhere that our turmeric is touching the paper, it's yellow, kind of what you would expect, like the color of turmeric.

But when it touches the part where we had baking soda, do you see the color it turned?

It turns red.

Why does that happen?

Well, it's because turmeric is something known as a natural pH indicator.

which means it changes colors when it's in the presence of an acid and a base.

What is baking soda?

Well, it's sodium bicarbonate or a base.

And so when turmeric interacts with baking soda, it turns red.

It goes from yellow to red to indicate that it is in the presence of a base.

Here's a trick to make your secret note even more secretive use cardstock

because cardstock doesn't absorb the water as much so you don't have those obvious ripples in the paper.

It takes a little longer for the water to dry but once it does it's even harder to see your message.

So let's go ahead and reveal this one.

Get my turmeric secret reveal paint on my paintbrush.

Watch with each brush stroke I'm revealing a part of my secret message.

You see what it says here?

It says, Stay curious and keep exploring.

You send your friend this message, but they have no idea what it says.

You tell them to reveal it with your magic turmeric paint.

Let's see.

You see what it says?

Meat in the treehouse.

Home.

And the best part is that your secret friendship note smells amazing.

Very spicy.

Smells great.

Thank you for making secret friendship notes with me.

100

If you like this one, be sure to check out my bestselling

101

Stay Curious and Keep Exploring book series for 99 more science experiments.

102

I'm Emily Calandrelli.

103

Subscribe for all things science and space.

104

And remember, stay curious and keep exploring.

105

I'll see you next time.

106

Emily's Science Lab

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이 레슨의 어휘와 말하기 포인트

이 말하기 레슨은 영상 “Invisible ink science experiment”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: secret, turmeric, baking, soda, message. 이 영상에는 섀도잉할 문장 106개와 단어 1095개가 있습니다. 말하는 구간의 길이는 7:15입니다. 화자는 분당 약 151단어로, 일상 대화에 가까운 자연스러운 속도로 말합니다. 단어의 83%가 영어에서 가장 많이 쓰이는 3,000단어에 속합니다. 나머지는 연습 전에 미리 확인해 두세요.

이 영상의 핵심 어휘

영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.

단어	발음	뜻
soda 명사	/ˈsoʊdə/	소다, 탄산 나트륨
bake 동사	/beɪk/	굽다
reveal 동사	/ɹɪˈviːl/	나타내다, 드러내다
friendship 명사	/ˈfɹɛn(d)ʃɪp/	우정, 우의
explore 동사	/ɪkˈsploɹ/	탐험하다
curious 형용사	/ˈkjʊɹ.i.əs/	호기심이 많은, 궁금하다
experiment 명사	/ɪkˈspɛɹ.ə.mənt/	실험
finger 명사	/ˈfɪŋɡɚ/	손가락
acid 명사	/ˈæsɪd/	산
sheet 명사	/ʃit/	장, 시트
indicate 동사	/ˈɪndɪˌkeɪt/	가리키다
brush 명사	/bɹʌʃ/	솔, 브러시
depend 동사	/dɪˈpɛnd/	의존하다, ...에 달려 있다
react 동사	/ɹiːˈækt/	반응하다
subscribe 동사	/səbˈskɹaɪb/	구독하다

따라 말해 볼 만한 문장

영상에 나오는 짧고 완결된 문장으로, 일상 대화에서 그대로 쓸 수 있습니다:

You don't want it to be too wet.
What is my secret note saying?
Do you see what's happening?
You see what it says here?
You see what it says?

이 영상의 문법

화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.

문형	영상 속 표현
현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때	you've worked · I've written
동사 + -ing enjoy, keep, stop… + -ing — 뒤에 -ing형이 오는 동사	Keep exploring
최상급 the -est / the most … — 집단에서 가장 높거나 낮은 것	our best · the best
“going to” 미래 be going to + 동사 — 계획이나 곧 일어날 것이 분명한 일	are going to draw · are going to reveal · are going to make

주의할 발음

화자는 I'm, we're, don't 같은 축약형과 약화된 형태를 34번 사용합니다. 들리는 대로 짧게 발음하세요.

“sh”와 “zh” 소리: friendship /ˈfɹɛn(d)ʃɪp/, sheet /ʃit/, brush /bɹʌʃ/, caution /ˈkɔːʃ(ə)n/, paintbrush /ˈpeɪntˌbɹʌʃ/
긴 단어 — 강세 위치에 주의: experiment /ɪkˈspɛɹ.ə.mənt/, indicator /ˈɪn.dɪˌkeɪ.tə(ɹ)/, ingredient /ɪnˈɡɹiːdi.ənt/, bicarbonate /baɪˈkɑɹ.bə.neɪt/

한국어 화자가 어려워하는 소리:

/f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: friendship /ˈfɹɛn(d)ʃɪp/, finger /ˈfɪŋɡɚ/
/v/ — ㅂ(/b/)과 구별하기: reveal /ɹɪˈviːl/, dissolve /dɪˈzɑlv/, secretive /ˈsiːkɹɪtɪv/
/r/과 /l/ 구별하기: reveal /ɹɪˈviːl/, explore /ɪkˈsploɹ/, ripple /ˈɹɪp(ə)l/

이 영상으로 연습하는 방법

먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
자신의 목소리를 녹음해 원본과 비교하고, soda, bake, reveal 같은 단어에 특히 주의합니다.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

섀도잉 방법: 단계별 전체 가이드 읽기 →

쉐도잉 연습: Invisible ink science experiment - 영상으로 영어 말하기 배우기

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