About NAKAHARA MASAE
About TAKAHASHI SHOJI
About 日本石材産業協
About 香川県産業技術センター研究報告
About stone material
About quality control
About machined surface
About residue(object)
About lead
About detection method
About X-ray fluorescence analysis
About elution test
About XRF
About Natural stone,ceramic products
About 石材
About 安全性評価