I have been considering using a cone 10 Raku clay body to make mugs.
The last step for the mug is to line the inside with a clay body that matures at cone 3. Armadillo's Longhorn White Clay meets that requirement. Bisque fire the mugs, glaze them with cone 3 glazes, and fire the pots to cone 3 in a Raku kiln. Pull the pots and place them in sawdust, or reduction chamber and get the reduction effects on the still porous cone 10 exterior. I know that the available raku kiln will reach cone 3 in an additonal half hour of firing.
If someone wants to do the experiment for me, go ahead. I have two other projects that must be completed before I can do more than though experiments.
One problem is that not many raku glazes work above Cone 04, so you would have to reformulate the glazes.
Another problem of course would be getting those two clay bodies to play nice together.
Another would be that all the raku glaze effects might be gone after your customers throw the mug in the dishwasher ... and they will, because it's a mug.