How-to: Homemade Sidewalk Chalk

tear off the cardboard toilet paper tube to see your new chalkNOTE: Don’t you dare pour any unused plaster of Paris down your drains! You can take containers outside and rinse them out with your garden hose, or wait until the plaster has set on a container and then chip it off, but in our house we tend to use stuff that’s on its last legs, anyway–the cups that came with our take-out pizza, old paint stirrers or sticks from the yard, rinsed-out deli containers, etc.

In the same vein, don’t wash your molds until you’ve thumped off all the dried plaster around their edges. Cardboard molds can be dropped back into the recycling bin, but if you’ve cut up a recycled plastic mold so much that it no longer has its recycling number on it, you’ll likely have to toss it in your regular trash.

Next >> Step 4

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Written by Julie Finn

I'm a writer, crafter, Zombie Preparedness Planner, and homeschooling momma of two kids who will hopefully someday transition into using their genius for good, not the evil machinations and mess-making in which they currently indulge. I'm interested in recycling and nature crafts, food security, STEM education, and the DIY lifestyle, however it's manifested--making myself some underwear out of T-shirts? Done it. Teaching myself guitar? Doing it right now.

Visit my blog Craft Knife for a peek at our very weird handmade homeschool life, and my etsy shop Pumpkin+Bear for a truly odd number of rainbow-themed beeswax pretties.


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  1. Thinking of making some chalk, but also thinking that with the limited amount of time I have, I might as well just buy some. Grr, I can’t wait for my college classes to be done! One more year. One. More. Year.

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