1) “The company’s work is done in the darkness and gloom, not on the lit water.”
Explanation: In the above quote, darkness is defining the happenings in a company's platform. It gives us a picture of the darkness that is present in a rule of emperoer and the risk it consists of.
2) “Man, we just love sunsets. Everything is bathed in heavenly white light.....Oh, wait. Except the western horizon.”
EXplanation: From this example , darkness though is not representing the rule of emperor but it shows the low level of moral values that are present in the place termed as “western horizon”. In the passage it has been shown that ruling is not meant to be only about, intense and selfish desire for wealth and power, rather it is a far broad phenomenon which is termed as “heavenly white light.”
3) “And this also,” said Marlow suddenly, “has been one of the dark places of the earth.”
Explanation: This part of writing depicts the "darkness" found in Congo. The punctuated quote tells us the differences and resemblances of the real idea of the
simply spotless mechanisms occuring in a civilized nation and that of the rule of emperor.