Is there wire that can be used as support in a clay sculpture and left in during firing without damaging the sculpture?

Yes, you can use stainless steel or iron wire as support in a clay sculpture during firing, as they can withstand high temperatures without deforming. However, it's important to ensure that the wire is not too thick, as it may cause uneven heating or thermal shock. Additionally, some artists prefer to use high-fire clay that can tolerate the presence of metal, but it's always advisable to conduct a test with your specific materials to avoid any issues.