Disclosed herein are compositions that include polyethylene glycol alkali metal sulfate electrolytes selected from the group consisting of sodium bicarbonate, sodium chloride, and potassium chloride or a mixture thereof and a gastro-protected dye composition comprising a gastro-protectant and a dye suitable for use in an internal colon examination procedure. Also provided herein are sachets, and containers, e.g. sachets that include disclosed compositions kits for colon cleansing, and aqueous solutions suitable for colon cleansing.
