The analysis of electron microprobe indicates that the brown one has higher content of MgO, FeO and lower SiO2, K2O, and characteristic of Na2 O > K2 O by comparison with the colorless glasses.

• 玻璃的电子探针分析结果表明,褐色玻璃具有相对高的MgO、FeO和相对低的SiO_2、K_2O、Na_2O含量及Na_2O>K_2O的特征。