Question

Is it safe to burn paper in a glass bowl? I don't have a cauldron so I'm trying to find a good substitute.

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I have used a bowl for burning paper and a few other things. But I have a very thick bowl that I know can take the heat. It also needs to be deep enough to prevent any ashes or sparks from getting out. While having a cauldron is nice I use a bowl much more then a cauldron. But any bowl or tool i use i never use for household or any other use. Just be safe, when I first started I was using jar lids for candle holders and to catch dripping wax. Intent, purpose, and understanding what you are doing is more important then having certain tools.

This very much depends on the quality of the bowl being used. Heat-safe bowls that can be used in the oven, or that are otherwise noted for being unharmed when exposed to high temperatures, are your best bet. On the other hand, rarely do such temperature ratings take into account the glass being exposed to direct flame.

If you're uncertain, or you'd rather just play it safe, put some sand or soil in the bowel and burn the paper atop that.

Having once seen a glass bowl explode while burning paper in it, and then have the remains char spots in the rug I would advise against using a glass container when burning paper or anything else.

A metal bowl, even the small ones you can buy to put pet food in, would be a safer choice. However, if you use a metal bowl be sure to put a tile or hot pad under the bowl so the heat doesn't damage the surface it sits on. I would also suggest putting a layer of sand, dirt, or even kitty litter in the bottom of the bowl to keep the metal from getting too hot.