The so-called tricolor principle is also known as the primary color principle.
It is a fundamental principle of chromatics.
It refers to using red, green, and blue as primary colors that, when mixed in different proportions, can produce almost every color perceivable by human vision.
At the moment, Lin Dong is treating the three Sword Intents as the colors red, blue, and green, using the tricolor principle to fuse the three Sword Intents.
Creating a new Sword Intent!
Just like how three colors create a new color.
"I understand now, the fusion of the three Sword Intents is not merely like earth or water flow, simply fusing them together."
"If they were just simply fused together, they would only change in volume, size, and other external things."
"But to fuse three Sword Intents, merely changing the external matters isn't enough. The internal must also change!"
