Heat the required amount of water to 80-90℃. Add MC gradually while continuous stirring. The formed slurry can change into uniform aqueous solution after cooling. Or, add 1/3 to 2/3 of required hot water, then heat to 80-90℃ . Add MC gradually while continuous stirring. Add the remaining ice water or ice when MC swells. Stir and cool it to form uniform aqueous solution.