The candle is Yod י, the flame that ascends from it is Vav ו, and its flickering movement – here and here – is Hei-Hei ה־ה.
And of ‘the other side’, there is a candle of darkness of hell (gehinom), and it has three colours. The colour red is the liver: (Gen. 36:1)... Esau is Edom. The gall bladder is green, the spleen is the colour black, and of it is stated: (Gen. 27:1)... and his eyes were dimmed from seeing...
And your sign for these colours: (Lev. 14:37)... greenish or reddish stains, and their appearance is lower (shaphal) than the wall. Shaphal (low) is the colour black,