A series of dispersing and leveling agents for polyester dyeing. Combination of functionality including dispersing difficult dyes and auxillaries, retarding type leveling for tight shade control of difficult colors (NICCA SUNSOLT RF-560), in-bath scouring to reduce spots and stains (NICCA SUNSOLT SN-530), and optional carrier for leveling in continuous lines, stripping, or reworks (NICCA SUNSOLT RX-22).