This week I let the window open by night to suppor...

Dropping the temperatures at lights out will severely increase the RH, unless you can keep it in check. I would advice you against doing it, purple buds are not worth the risk of botiritis

Hey Dave!! It should help out but you may not start to see much color until the last 2 weeks of flower, that is when most tend to really mature and get the "autumn" like colors sometimes its even just in the last few day every strain is different. So you may want to wait another week or 2 before dropping the temps like that. because the only downside is with a temp. Drop that much mold can come along but as long as you keep your RH down like you have it you should be good just keep a close eye on them👍👊 They will get some color though. It is just going to take a little more time for it to happen. Happy Growing!!🙏