shade, murkiness

DARKNESS
WordClue
DUSKdarkness, obscurity
GLOOMDarkness, dimness or obscurity
HEART... of Darkness (Conrad)
KHAKIcolor shade of yellowish-brown
SHADEdarkness, murkiness
INDIGOdeep and bright shade of blue
SCREENcurtain, shade
CURTAINshade, arras
DIMNESSdarkness, gloom
MURKINESSdarkness, dimness
NIGHTFALLdarkness, dusk
OBSCURITYDarkness
CURTAINshade, arras
MONGOLSshah - Persia, khan - ?