章 920: Chapter 920 Glass

"Oh…" The Emperor responded thoughtfully and then seriously sized up the lampshade.

Gu Chengrui did not give him any further explanation.

Instead, he picked up a lampshade and walked to the oil lamp. After lighting it, he covered the oil lamp.

Instantly, the room became much brighter.

The Emperor's eyes immediately lit up. He had been reading memorials at night for many years, so he could not be clearer about the brightness of the oil lamp.

Even if there were eight to ten oil lamps in the room, they would not be able to reach such brightness.

He walked over and muttered, "This is excellent stuff."

"An accidental discovery." Gu Chengrui added as he covered the lamp with an abandoned booklet on the side. A moment later, the light went out by itself.

"Why..." The Emperor was surprised, but he quickly understood what was going on.