Thanks very much, John and TJR, for your trouble and information. Well, given that I don't actually own a kiln, if the lustre needs to be fired at all, even at a very low temperature, then I need to go to an expert. But John is probably right, too, that perhaps I should leave it as it is. It's a 1920 Royal Crown Derby teapot. I don't know that I care so much about the material "value"--it's really a piece that I live with and use--but I also don't want to wreck it, or have it wrecked. That said, I'm finickity about detail and good with my hands (I paint and draw in diminutive detail...) and I have not been pleased with the last two things I had repaired by "experts"--a fancy shmancy place in Philadelphia repaired a broken china bowl, charged an arm and a leg, and did a crummy job. So, too, with an oriental rug repair which deprived me of my other arm and leg and repaired a bit of damaged fringe by just sewing a patch of fringe instead of re-weaving, and I thought, GAWL, if I'd known that THAT was what they were going to do, I would have done it myself, as I did with some cloisonnÃ© repair, which at least is invisible. The trick is finding the right expert (and having the money to spend, too, alas). Thanks again!