brown (chestnut-colored)
Tienes el cabello más castaño que negro.
Your hair is more brown than black.
— Un asunto de familia (2018)
Él pasa la mano por su largo cabello castaño y rizado.
He runs his hand through his long, curly brown hair.
Mary tiene el pelo corto, castaño y rizado.
Mary has short, brown, curly hair.
Nos estamos tiñendo el pelo castaño.
We are dyeing our brown hair.
Tom se tiñó el pelo castaño oscuro.
Tom dyed his hair dark brown.