And aqueous solution of calcium hydroxide may work after all. This can work if it is kept hot enough so that the ammonia will not be absorbed by the water. It so happens that ammonia will not dissolve in water very well if it is hot enough.
Update:
The above is incorrect. Darn it. Now I wonder if it will make any difference? If it becomes saturated, then the ammonia will not be absorbed past that point. The only thing is that it may make a difference in the formation of calcium carbonate.
Al Fin: "Cowboy Commentary", aka "Eat your veggies" The Flag banner is posted in order to defy those who would make patriotic symbols illegal or disreputable.
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