Goldenrod Valentines Make Your Own Color-Changing Valentines! email to friend
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Goldonrod Valentine Doily

1. Fold one piece of Goldenrod Paper in half and cut out heart shape from center fold.
2. Fold heart shape cut out 2-3 times more and cut out smaller heart shapes or other patterns of your choice, then unfold the paper.
3. Lay the heart flat on a tray with 4-5 cm (1.5-2 in) rims (ie: baking pan, plastic container or dinner plates work well) to contain the ammonia solution.
4. Dip a cotton ball in the ammonia solution and swab the doily from side to side to turn the paper from yellow to red. You may also use a squirt bottle for precision saturation or write a disappearing message like LOVE or BE MINE.  You can also simply poor a small amount of the ammonia directly on to the doily.
5. After your message fades away, use a candle or yellow crayon to write a "secret message" inside the heart doily and follow step four to make the message appear again.  It's science Valentine magic!
6. Finally share the love with a family member, friend, or "person of interest" and they will be yours forever!

Goldenrod Human Heart Cut-out

1. Find a basic drawing or picture of the human heart and trace the image on to a piece of Goldenrod Paper.
2. Use a permanent, thin point magic marker to outline the parts of the heart... like the Aorta, Coronary Arteries or the V. Cava Superior.
3. Lay the human heart cutout flat on a tray with 4-5 cm (1.5-2 in) rims (ie: baking pan, plastic container, or dinner plates work well) to avoid spilling the ammonia solution.
4. Dip a cotton ball in the ammonia solution and swab the specific parts of the heart as read off by a teacher in class or as a student to help with memorization.
5. Write the names of the heart parts next to the parts themselves to complete the diagram.
6. By the end of the activity all parts of the heart should be the color red with the correct names listed next to the parts. Now that's a healthy heart!

 

How does it work?

The ammonia on the cotton ball is a base and causes the dye in the special goldenrod paper to change color. You probably noticed that the red color fades over time and the paper eventually changes back to its original yellow color. Why? The carbon dioxide gas that is in the air we breathe is slightly on the acidic side of the pH scale. The carbon dioxide reacts with the ammonia on the paper to produce ammonium carbonate, which changes the pH of the paper to neutral (roughly a pH of 7) and the dye changes back yellow. If you use a stronger base like washing soda, the red message will not disappear with just the carbon dioxide in the air. You will need to use a stronger acid like lemon juice or vinegar to change it from red to yellow. You can also use goldenrod paper as inexpensive pH paper to classify safe household products as being either acidic or basic.