To make further progress, however, required pure forms of substances, for if impurities were present then these confused the picture by producing lines. Kirchhoff was able to make his fundamental breakthrough by producing purer forms of substances than had been previously the case.
Tegema täiendavaid edusamme, kuid vajalikud puhtad vormid aineid, kui lisandeid olid kohal siis need segi pildi toodavad read. Kirchhoff suutis teha tema olulise läbimurde esitades puhtam vormid ained, kui oli varem juhtunud.