Sidewalk chalk isn't that expensive, but when your going through a pack a day (yes, I'm exaggerating) then it can add up so I wanted to try and make my own
Homemade Sidewalk Chalk
You Will Need:
Plaster of Paris
Empty toilet paper/ paper towel tubes
Prepare your tubes by cutting down the middle and line the inside with the wax paper. Roll the tube back up to the size you want it to be and tape close. Cover one end with wax paper so your mixture doesn't come out. Mix 1 cup of Plaster of Paris with 3/4 cup warm water, then added a couple squirts of tempera paint and stir. Pour mixture into your prepared rolls and let dry for several hours.
Note: don’t add too much paint, it will change the consistency of the chalk, and will crumble easy. A couple of squirts, or no more than 2 teaspoons will work fine.
I had no idea what Plaster of Paris was, but I found it in the craft section of Walmart.
Instead of wax paper, I used Saran Wrap Press N Seal. It worked well and I didn't have to worry about it shifting around when it was time to pour the mixture in.
As I started to mix everything together I realized I was in trouble. The mixture was hardening VERY quickly. By the time everything was mixed I had a pretty thick putty that was hard to get into the tubes.
It took about 5 hours for it to be completely dry and the tubes pealed away very easily
The Verdict: Lets do a pro and con list for this one shall we?
That sums up the pro list
-It was very messy. The Plaster of Paris got all over the place, especially when I was frantically trying to get the mixture into the tubes before it got to hard.
-It took 30 minutes of work, then another 15 to scrub everything
-It was more expensive. For 1 piece of homemade chalk it cost .37. For walmart chalk it cost .12
-The color didn't last. By the end of the day all of the kids drawings were bleached to white.
Unless you want a huge mess, I would skip this one and stick to the store bought.