bible science experiment invisible ink

bible science experiment invisible ink

Jesus’ Baptism Science Experiment: Invisible Ink

Many Catholic Christians and some Protestants will be celebrating the baptism of Jesus on Sunday January 12th. Many people over the years, including John the Baptist, felt surprise that Jesus should be baptized. But God is often like that – he does things that surprise us, and his behavior seems a little “cryptic.” In this Bible science experiment, the use of invisible ink, in honor of Christ’s baptism, can help kids understand how hard we have to pay attention to understand God.


– Lemons

– Q-tip or painter’s brush

– White paper

– A source of heat. Can be a warm iron, a hair dryer, or a table lamp.


The Gospel of John tells us that when Jesus came to be baptized, John was confused. He thought he should be baptized by Jesus and not the other way around. He did not see the hidden message that Jesus

understood. That message was that Jesus’ baptism was the beginning of His service to His Father as one who would die for the sins of the world. And God the Father approved it, and sent God the Spirit to empower it. When we think we don’t know the answers to problems of faith and commitment, know that we can’t always see the hidden message that may explain why “bad” things happen. Praise the Lord and strengthen your commitment to the Faith and Love He has given us.


1. Use whole lemons to squeeze juice into a small bowl.

2. Dip artist’s brush or Q-tip into the lemon juice.

3. When the bristles of the brush or the Q-tip are saturated, use the brush to write a message on white paper. Keep dipping the brush as needed to complete the message.

4. Wait several minutes for the paper to dry. When it is dry the message will disappear.

5. When you see the hidden message, expose the paper to a source of heat. The paper can be held under a lit light bulb (not for younger kids to do), a blow dryer will work, or if possible, a warm iron.

6. After of short time of being exposed to heat, the message will begin to darken to a pale brown color revealing what the message is!


Lemon juice is acidic, and the acid remains in the paper after the lemon juice has dried. When the paper is held near a source of heat, the acidic parts of the paper will slightly burn or turn brown before the rest of the paper does. As soon as the message appears take the paper away from the heat so the paper doesn’t burn.


As soon as Jesus was baptized, He went up out of the water. At that moment heaven was opened, and He saw the Spirit of God descending like a dove and lighting on Him. And a voice from heaven said, “This is my Son, whom I love; with Him I am well pleased.”

The baptism of Jesus was unique because Jesus was sinless. By his baptism Jesus identified with the sinful people He came to save. And by His baptism Jesus submitted to the will of the Father. Remember that we don’t always see the message God sends to us, but we can pray daily and thank God for giving us the wisdom to learn about Him that helps us grow as Christians.


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