^^ yup, since the plant is still alive within the week you are drying it, it can and most likely will turn purple..
The way I make any of my plants go purple, and I literally mean ANY is inducing flowering under an hps, then after the flowers are done developing and have not swollen yet, is when i put them outside in cold weather, about 40 degrees, over a few weeks they will turn purple. ALL of my plants all different genetics are turning violet, pinkish purple, and black
One plant however which was really unique being that it didnt even grow many flowers anywhere, like single flowers at single nodes, that didnt even turn purple, but it was the healthiest plant i have ever had, the leaves were so waxy and shiny that it was like a mirror haha
One is a headbanger, og skywalker, and 2 unknown bagseed. None of which have purple in their names nor have i even seen a purple of these strains. Albeit they grew small since i transplanted them right when i induced flowering but still they are pretty damn awesome. They have such deep purple to them.