Passage Summary: Because ancient Chinese chemists used the same materials and high-heat techniques for both a specific purple dye and common white glass, scientists think the dye was just a lucky byproduct of glassmaking.

Conclusion: The creation of the pigment Han purple was likely an accidental discovery made during the process of manufacturing white glass.

Reasoning: Both Han purple and a common white glass from the same era used identical chemical ingredients and similar production methods involving high heat and lead additives.

Analysis: The argument relies on the overlap between two manufacturing processes to claim one caused the other. To strengthen this, we want to make that overlap even tighter. If we find out that the specific conditions required to make white glass are almost exactly the same as those that produce Han purple, the 'accident' theory becomes much more convincing. Look for an answer that suggests the two substances are essentially two sides of the same chemical coin.