For whatever reason, some kids seem to love eating crayons. Binney & Smith, the makers of Crayola products, have taken precautions to help keep crayons safe for little munchers. The company makes crayons from two main ingredients: pigment and paraffin wax. Neither ingredient is considered toxic. The problem is that Crayola crayons come with labels on them, which are made from paper and held on with glue. Paper is usually relatively harmless if ingested. Binney & Smith has to use a nontoxic cornstarch and water mixture for its glue, just to make sure that children don't get poisoned. As long as they aren't eating tons of Crayola crayons, your kids will be safe if they have a small, unsupervised wax snack.
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