dark brown; colour of tanned skin
「褐色」 has another reading with different meanings.
dark indigo (almost black)
彼女は褐色の瞳が印象的だ。
Her brown eyes are striking.
秋の山は褐色に染まっていく。
The autumn mountains are turning brown.
褐色の土壌は栄養が豊富だ。
Brown soil is rich in nutrients.