Nantian (广东南天司法鉴定所) is one of Guangdong’s larger private judicial appraisal institutions, approved by the provincial Department of Justice in 2003 and licensed under 344400007542512603 across nine appraisal categories. Its 痕迹鉴定 and 微量物证鉴定 registrations include 火灾痕迹鉴定 and 火灾微量物证鉴定 — the licence a Chinese civil court or insurer needs before a fire opinion can be admitted. Its published practice centres on document dating and questioned documents rather than fire, so an instructing party should confirm which appraisers are proposed for a fire matter. It occupies four floors of the Aidi Building in Futian, Shenzhen.