We had one white t-shirt left after making our patriotic shirts, so I went on a mission last night and found this site full of wonderful, sciencey, projects.
I had everything needed for this project already in the house, (which makes this a perfect activity).
permanent markers-we had Sharpies and Bic markers-they both worked fine
a bowl and rubber band to stretch the shirt taunt
pre-washed white t-shirt
After we spread out the colors, we used the blow-dryer to dry the design. I didn't want the wet marker to get onto the white shirt while we were working on another area. This shirt was easily done by Mark and Grace-on thier own. They are 8 and 6. I was just on hand to help them get the shirt adjusted on the bowl with the rubberbands.
Put the shirt in the dryer on high heat for about 15 minutes to set the ink.
Luke calls this his "crazy shirt".