deep red
赬 centers on a vivid, deep red color. It is a specific shade of red, often used in literary or classical contexts.
赬 combines 赤 (red) with 貞, which likely contributes the sound. The character is used to express a deep red color.
The left side 赤 means red, and the right side 貞 looks like a container holding something precious. Imagine a precious deep red dye stored in a container: 赬 is that deep red color.
For テイ, picture a deep red tea (ティー) being poured from a container: tea -> テイ, and the tea is the deep red of 赬.