The Rainbow Hidden Inside Black – a Chromatography Butterfly

"Black."

It's a color that is often linked with darkness, mystery, sadness, or simply the absence of color. Many people think of it as plain, empty, or ordinary.

But what if everything we believed about black wasn't completely true?

One day, while experimenting with paper chromatography, I drew a simple line using a black sketch pen on a piece of tissue paper. As I gently added water, something magical happened. The black ink slowly began to separate, revealing shades of blue, purple, pink, and other hidden pigments that had been there all along. It was a beautiful reminder that sometimes the most unexpected things are hidden beneath the surface.

That moment inspired this butterfly.

Butterflies are symbols of transformation, and I couldn't think of a better way to represent the hidden rainbow inside a black marker. Instead of using paints or colored paper, I let science become the artist. Through paper chromatography, water carried the ink across the tissue, separating the different dyes and naturally painting each wing with patterns that can never be exactly repeated.

Beyond creating a piece of art, this project is also a fun science experiment that demonstrates chromatography, capillary action, solubility, and pigment separation using materials almost everyone already has at home.

To me, this butterfly carries a simple message:

Never judge something by what appears on the outside.

A single black line may seem plain, but inside it hides an entire rainbow waiting to be discovered. Just like people, ideas, and opportunities, true beauty isn't always visible at first glance. Sometimes, all it takes is a little patience and the right perspective to reveal the colors that were there all along.

So, let's combine science, creativity, and a little bit of wonder to reveal the rainbow hidden inside black.

To create your Chromatography Butterfly, you'll need only a few simple materials that are easy to find at home or in a classroom.

1. ️ Black Sketch Pen (water-soluble works best for chromatography)
2. A3 White Paper (used as the background and butterfly body)
3. Tissue Paper or Coffee Filter Paper (for the butterfly wings)
4. Glue Stick
5. Clean Water
6. Small Container or Bowl (to hold the water)
7. Dropper, Pipette, or Cotton Swab (optional, for controlled application of water)
8. ✨ Small Golden Circular Stickers or Golden Craft Pearls (for decorating the lower wings)
9. ✂️ Scissors (to cut the butterfly wings and body)

Before creating the butterfly, let's first understand the science behind it!

Paper chromatography is a simple technique used to separate the different pigments hidden inside an ink. Although a black sketch pen appears to contain only one color, it is actually made from a mixture of several colored dyes. When water moves through the paper, these dyes travel at different speeds depending on their solubility and how strongly they stick to the paper. As a result, the hidden colors begin to separate, revealing a beautiful spectrum.

What to Do

1. Cut a small strip of tissue paper or coffee filter paper.
2. Draw a thick black line about 2 cm from the bottom using your black sketch pen.
3. Pour a small amount of clean water into a container.
4. Place the paper strip into the water, making sure only the bottom edge touches the water. The black line should stay above the water level.
5. Watch carefully as the water slowly climbs up the paper through capillary action.
6. Within a few minutes, you'll notice the black ink separating into different colors such as blue, purple, pink, green, or yellow, depending on the marker you are using.

💡 Tip: Not every black marker produces the same colors. Try testing different brands to discover which one reveals the most vibrant rainbow. Choose the marker that gives the best results before making your butterfly.

Now that you've discovered the hidden colors inside your black marker, it's time to create the butterfly's wings.

To make the butterfly look neat and symmetrical, we'll cut both upper wings at the same time.

Instructions

1. Take two sheets of tissue paper (or coffee filter paper) and stack them neatly on top of each other.
2. Fold or hold the papers together so they don't move while cutting.
3. Draw the outline of one upper butterfly wing, or use a printed template if you prefer.
4. Carefully cut along the outline using a pair of scissors.
5. Once you separate the two layers, you'll have two identical upper wings—one for the left side and one for the right side of your butterfly.

💡 Tip: Cutting both layers together ensures that the wings are perfectly matched, giving your butterfly a more realistic and balanced appearance. If the tissue paper shifts while cutting, use a small paper clip or binder clip to hold the layers together.

"Nature loves symmetry, and so do butterflies. By cutting both wings together, you're giving your butterfly the perfect balance before the colors bring it to life." 🦋

Now it's time to create the pattern that will reveal the hidden rainbow.

Using your black sketch pen, carefully draw the wing veins and outlines on both tissue paper wings, just like the pattern shown in the reference image. These black lines will later separate into beautiful colors when water is added.

Instructions

1. Place the two tissue paper wings side by side.
2. Using a black sketch pen, trace the outer edge of each wing.
3. Draw the curved veins extending from the center toward the edges, following the pattern shown in the image.
4. Make the black lines bold and evenly spaced so there is enough ink for the chromatography effect.
5. Repeat the same design on both wings, keeping them as symmetrical as possible.

💡 Tip: Don't worry about making every line perfectly identical. The chromatography process will naturally create unique color patterns, making each butterfly one of a kind.

⚠️ Important: Use a water-soluble black sketch pen. Permanent markers (such as Sharpies) usually won't separate into different colors because their ink isn't water-soluble.

Now comes the most exciting part—the moment when science transforms your black butterfly wings into a beautiful rainbow.

As the water slowly travels through the tissue paper, it carries the ink with it. Since each pigment moves at a different speed, the hidden colors begin to separate, creating a unique pattern on every wing.

Instructions

1. Pour a small amount of clean water into a shallow container or bowl.
2. Hold one butterfly wing vertically and gently dip only one edge of the tissue paper into the water.
3. Make sure the black ink lines stay above the water level. The water should only touch the edge of the tissue paper.
4. Leave the tissue paper undisturbed and watch as the water slowly climbs upward through the paper.
5. As the water reaches the black ink, you'll begin to see beautiful shades of blue, purple, pink, and other hidden pigments appear.
6. Continue waiting until the water has traveled across the entire wing or until you're happy with the color separation.
7. Carefully remove the wing and place it on a flat surface to dry completely.
8. Repeat the same process for the second wing.

💡 Tip: Be patient! The slower the water moves, the more distinct and beautiful the color separation will be. Avoid moving or squeezing the tissue paper while it's wet, as it can easily tear.

⚠️ Important: Only dip the edge of the tissue paper into the water. If the black ink is submerged directly, it may dissolve too quickly instead of separating into its hidden colors.

Now that the hidden colors have been revealed, it's time to let the wings dry before assembling the butterfly.

Instructions

1. Carefully remove the tissue paper wings from the water.
2. Lay them flat on a clean, dry surface.
3. Let them air dry in the sunlight or use a hair dryer on the lowest heat and speed setting.
4. Wait until the wings are completely dry before handling or gluing them.

💡 Tip: Avoid using high heat, as wet tissue paper is delicate and can easily wrinkle or tear.

While the wings are drying, let's prepare the butterfly's body.

Using a black sketch pen, draw the butterfly body and antennae on an A3 white sheet, following the design shown in the reference image. This will serve as the base onto which the colorful tissue paper wings will be attached.

Instructions

1. Place an A3 white sheet on a flat surface.
2. Using a black sketch pen, draw the butterfly's body, head, and antennae just like the reference image.
3. Add the wing outlines to help you position the tissue paper wings accurately.
4. Make the body lines bold and clean so they stand out against the colorful wings.

💡 Tip: If you're not confident drawing freehand, lightly sketch the design with a pencil first and then trace over it with the black marker.

Now it's time to assemble your butterfly and watch it come to life!

Instructions

1. Apply a thin, even layer of glue stick to the back of one upper wing.
2. Carefully align it with the wing outline on the A3 paper and press it down gently.
3. Repeat the process for the second upper wing, ensuring both wings are symmetrical.
4. Using a black sketch pen, redraw the butterfly's body outline and antennae. This step is necessary because they may have been partially covered by the tissue paper.

Optional: For an even cleaner and more defined look, you can also trace the outer edges of the wings and redraw the wing veins over the tissue paper.

💡 Tip: Apply only a small amount of glue to avoid wrinkles, and use smooth, steady strokes while retracing the outlines for a neat finish.

Your chromatography butterfly is almost complete! The final step is to add a few decorative details that make the artwork stand out.

Instructions

1. Take the golden circular stickers.
2. Peel and stick them onto the lower wings, following the pattern shown in the reference image.
3. Space the stickers evenly to create a balanced and elegant design.
4. Press each sticker gently to ensure it sticks firmly.

✨ Optional: You can add a few extra stickers or small embellishments if you'd like to personalize your butterfly.

💡 Tip: Less is more! A few well-placed golden dots beautifully complement the colorful chromatography wings without taking attention away from them.

Through this project, we explored how science and creativity can come together to create something beautiful. Here's what we learned:

1. 🌈 Paper Chromatography – A technique used to separate the different pigments hidden inside black ink.
2. 💧 Capillary Action – How water naturally travels through tissue paper, carrying the ink along with it.
3. 🎨 Color Separation – Why a black sketch pen can reveal shades of blue, purple, pink, green, and other colors.
4. 🦋 Science Meets Art – How a simple scientific experiment can be transformed into a unique piece of artwork.
5. 🔬 Experimentation – Different brands of black markers contain different pigments, so each one creates its own unique color pattern.
6. 💡 Creativity & Observation – Even ordinary materials can produce extraordinary results when viewed through the lens of science.

The biggest lesson: Sometimes, the most beautiful colors are hidden where we least expect them. 🌈🦋