I have heard 3 ways, and I am sure there are more, to turn buds purple. The most common recommended way is to lower temps, especially at night. I have also read that the last two weeks of flowering if you water with ice it will turn them purple. I have also read that if you take fresh cuts and put them in the fridge for a couple of nights before starting the harvesting process it will turn the buds purple. Have any of you tried any of these 3 techniques and did any of them seem to work very well?