This discoloration qualitatively suggests that the substance is low in inorganic iron. 从定性的角度考虑，这种褪色表明这种物质的无机铁含量很低。
Titanium white powder and characterization of its inorganic substance coverture functionality 钛白粉及其无机物包覆功能性表征
The Efficacy of Radix Ginseng on Spinal Bone Mineral Density and Bone Inorganic Substance of Osteoporosis in Ovariectomized Rats 人参对骨多孔症白鼠的脊椎骨密度和骨无机质成分的研究