Purple Punch Auto is not purple , yellowing ,

Thank you for the responses, now after watering I put 4 ice cubes on the coconut and after 3 days the pink color starts to show faintly. Maybe it will have a weaker shade.

I grew a purple punch photo that didn’t really go purple but the last cherry cola auto I grew was purple as , you are right it’s temperature related . I tried ice water and all sorts to get the purple punch to go purple lol but all good , your buds look real nice

They don't always go purple but the yellowing may be just the fade. Which is good. You say temps are 25. Try lowering both day and night temps. I use a product by new millennium called winter frost. Used in the penultimate week. Look into it. It makes anything change colour

The flower was the last 2 weeks fed: 1 l water, plagron coco a, b 5 + 5 ml, 2ml bud candy, 2ml big bud coco, 1ml plagron pure zim . Medium Coco, 18/6. After a reduction in Coco A+B to 3+3 ml (because PPM was lifted), the flower began from the bottom of yellowing. What could be a problem? How much still do you have to harvest? Thank you