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早在六世纪时,我国萧梁时期的医药学家陶弘景就指出,真硝石“烧之紫青烟起”(把火焰染成紫色),借此可以与芒硝(Na_2SO_4·10H_2O)相区别。唐代垂拱年间的凤阁舍人唐诜是位方士,曾根据铜会把火焰着上绿色(“五色烟”)以区别炼丹家们的药金(铜合金)与真黄金。1758年时,德国矿物学家S.A.Marggraf(1709—1782)也提出利用焰色来分辨苏打与锅灰碱(K_2CO_3)。这些事例可以说是利用光谱进行定性检验的先声,当然,他们对其中的道理是毫无理解的。
As early as the sixth century, Tao Hongjing, a pharmaceutical scientist in Xiao Liang of our country, pointed out that the true saltpeter, “Burning of the Purple Smoke” (the flame is colored purple), can be distinguished from thenardite (Na_2SO_4 · 10H_2O). During the Tang dynasty, the founder of the Tang Dynasty, who was a feng aristocrat, was an alchemist who once distinguished himself from the gold (copper alloy) and real gold of the alchemists by referring to the flame of copper on the basis of copper (“colored smoke”). In 1758, the German mineralogist S.A. Marggraf (1709-1782) also proposed the use of flame to distinguish soda and pot alkali (K 2 CO 3). These examples can be said to be the forerunner of using the spectrum for qualitative test. Of course, they have no understanding of the truth.