It's hard for me to say without reading the paragraph.
But, when you look at double action candles, they are 1/2 black and 1/2 another color. We then butt the top (where the wick is) and then scrape the black end to get a wick. Then, we light the black side first. So, what that does is banish the negativity and bring in the energies of the color that is at the other end.
Check out this page:www.luckymojo.com/reversing.html
There's a lot of information there.
Otherwise, I am not clear on what he's talking about 9as I have never read that book).