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With most spices I only keep the whole spice on hand: coriander, fennel, cumin, etc. But looking at my spice rack I see that I have both Colman's powdered mustard and mustard seeds. I never really gave it any thought, I just have both and use them when a recipe calls for one or the other. But is it necessary, or even desirable, to keep powdered mustard? Does it lose its potency faster than the whole seed (as with other spices)? Is it hard to grind because of the tiny, smooth spheres? Do you have both?