"Tangqin" is a relatively common ancient jade Qin shape.
Any ancient jade color that is light brown, reddish brown, tan or dark brown can usually be called "Tangqin". Just like people are used to calling black Qin "mercury Qin", "Tangqin" is actually just a conventional and popular name.
Related information:
Among the ancient jades unearthed in archaeological excavations, "Tangqin" is a relatively common Qin color, whether it is in the south or north soil or in dry or wet pits Ancient jade unearthed can be seen. The only difference is that jade watches have different expressions of "dryness" and "moistness". In some special geographical environments, "Tangqin" almost occupies an absolute proportion. It shows that Qinse is closely related to geology, landforms and water and soil structure.