Yes it is still safe to use. Its no different if you were to add water to them now or if they had absorbed the water from the air before.
Many of these chemicals (Calcium and magnesium mixes) are desicants to a degree in that they will absorb any moisture in the air. Just makes it hard to weigh/measure them.
I just recently found out that Dri-Air (the stuff you put into RV's and marine boats to take the moisture out of the air during storage) is just Calcium Chloride.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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