They became thick and hardened. Knowing that it did in fact work, I decided to use this as part of my Christmas craft. Each of the kids created a minifigure and wrote by it so it included their handwriting. After they were baked (or Hansel and Greteled as I told the kids), we used them as a charm on an ornament filled with a ribbon that was the height of each child. It's good to know that these work but here are a few lessons I learned if you want to try this.
We had planned to do the experiment on one day but as you can see from the picture, my elf stole the balloons to float around the room, so we postponed until the next day. Those that struggled with getting the three items to work together, were allowed to add either more paperclips or index cards. Only a couple of students were truly successful but it was great conversation piece to be able to have.
That's Elementary Explains is a teacher with almost 2 decades of teaching experience and a technology degree who is still trying to figure out the new and unexplained.