He had reddish brown hair.

他有一头略带红色的褐发。

《柯林斯英汉双解大词典》

Which one is the boy with the reddish brown hair?

那个红褐色头发的男孩是谁？

youdao

Salk is also called as Snake fruit because of its reddish brown-scaly skin. It is a species of palm tree. The origin of this fruit is Indonesia and Malaysia.

萨拉卡也称蛇皮果，是因为它红棕色鳞状的果皮，它是一种棕榈树，其原产地是印度尼西亚和马来西亚。

youdao

The path continues past the ruins of the old pueblo up toward the reddish brown wall of Frijoles Canyon.

VOA: special.2010.07.05

The body is light to reddish brown, but lighter on its underside.

VOA: special.2010.06.22

Stem rust produces reddish-brown spots on the stems of infected plants.

VOA: special.2009.08.18

As I got closer, vague shapes coalesced into the clean lines of German colonial-era buildings, all the same dusty reddish brown as everything else in that part of Africa.

WSJ: Kyle Mills on an Adventurer's Hotel in Namibia | Traveler's Tale

People with this disorder usually have reddish-brown skin, ginger or reddish hair, and hazel or brown eyes.

CNN: Albinism

Nitrogen tetroxide is a reddish-brown gas at room temperature and has a "pungent, sweetish" smell, according to experts.

CNN: Four compounds from shuttle can harm on contact