Will dying my top a second time make it darker?

I dyed my halter top today, it is 100% polyester so I used polyester dye (idye poly) and the top was originally bright blue (think of the color of a new wal mart vest lol) and I wanted to dye it black and i followed all the instructions (i dyed it in a pot on the stovetop, not the washing machine and i let it simmer for an hour while stirring). however sadly it resulted in only being a darker blue, almost a navy blue. Will Dying it a second time get it closer to black or will it likely just make it a darker blue?