Step-by-step tutorial
Step 1
To keep the element of surprise alive, I used a white crayon to write C's secret messages when he's not around. I like to mix it up with silly pictures, love notes, jokes...
Step 2
Then I invite C to join me. He uses watercolor paints to brush over the card, revealing the secret message below.
Final result!
Voila! Mystery solved. C loves discovering the surprise and I love the simple prep and clean up. It's a win-win for everyone.