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I'm assuming that this may be one of the weirdest questions asked on this forum. I have been comissioned to create an urn for the ashes of someone's mother. My first thought on sealing the urn was to use a silicone adhesive. It sticks to the ceramic ware well and is waterproof. Then I wondered... (this is where it gets weird...) What would happen if I put the ashes inside the urn for the glaze firing and used the glaze to fuse it permanently shut? My concern of course, is that since a cone 6 firing is hotter than the actual cremation process, would these ashes combust and cause the urn to explode. As you can well imaigne, I don't want my friend's mother blowing up inside of my kiln. (I told you this was going to be a weird one) Cremated ashes consist of: dry calcium phosphates with some minor minerals, such as salts of sodium and potassium. I don't supposed anyone else has tired this? If anyone has any ideas for sealing that are better then the silicone adhesive, I'd love to hear them as well. I'm not trying this unless I know it's not likely to end badly. Thanks in advance for humoring me by reading this.