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heirloomgal
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I didn't know that, you may be on to something indeed. The soil in the pot is likely acidic. Knowing that I can get them to flower from a late start (next year I'll plant them min. 8 weeks before LFD, not 4) I may create a purposely more basic potting mix and see if the flowers lose the purple tones. It is rather a surprise that they have been so quick to flower all things considered, and it is a plant I feel would be worth both trying to overwinter as well as trying again from seed just in case.
It may have to do with the acidity of your soil. The blue turns purple in the presence of acid (which is how they can make the ices change color by adding lemon juice.) I imagine, if one's soil were acid enough it might change the flower colors.