Dark blue, pink, dark blue, dark black. Describe, describe, describe. Flashy, ostensibly gorgeous and extravagant, vain and unreal. The whole poem means:

Open the pink book of poems, and the beautiful small print in dark black is the acacia I described. Because of who, I put on this luxurious satin, jewelry and flowers, and got the vanity of this life? The superficial splendor can't hide the inner anguish, and you can only tell your sadness in a drunken dream like a fairyland.