If one wanted to turn bud purple...?

If someone got seeds from a reputable person/business that have a chance of turning purple. Would it help induce the process of turning the bud purple if you did the following?

1- The last 3 weeks before harvest, drop the night time temperature to 55-60*.

2- Two days before harvest keep them in a room at 55-60* in the dark for 48 hours.

3- If by now the bud isn't purple you can harvest the bud, put all of it in the fridge and wait for 4-8 hours. Then dry/cure.

Please correct me if I'm wrong, I'm just trying to put together things from different posts I've read here.

Thanks for helpful replies!

Not all strains will turn Purple, but yes.. having cooler temps throughout your night schedule will help aide in its process.

The first option should work fine. As for the last two i could'nt tell ya.