A joke hidden in a Japanese name
Flattery is an English nickname for kobicha, one of the traditional colors of Japan. Both names share the code #6B4423, and so does brown-nose. Kobicha has been used for kimono dyes since the year 660, according to Japanese color handbooks cited by the Wikipedia article on kobicha.
The Japanese word first named the color of a kind of kelp tea. Over time it also came to mean a sort of flattery. That meaning is most likely the source of the English name. It lines up neatly with brown-nosing, the English slang for trying too hard to please a boss.
Using this brown
This is a strong orange brown, a little redder than coffee. White text on it has a contrast ratio of 8.48 to 1, so light type works well. Try other pairs in the contrast checker.

