Following @Cigar 's suggestion, I have installed my 3 powders, still in their original containers as sold to me, in a non working refrigerated chilly bin under the bench in my free standing garage. I also included a max / min thermometer and have noted over the last few totally sunny, warm, days the min is 17c and the max 23c. Seems to be a temperature solution but awaiting @Maca49 's development of "volatile."
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