And people think its a ph thing. I am like 99% sure it’s not a ph alteration, but rather just letting a purple plant thaw out to collect the water soluble purple pigments.
If you press wet flower you’re ringing out all of the water like a towel and along comes the water soluble pigments. I have pressed 100% purple flower that was bone dry and it came out as plain old amber rosin. I have pressed bright green flower with barely any visible purple that was literally cut right off the plant and it came out completely purple.
If you want to test this theory, take some semi-purple flower and put it in a mesh strainer and hold it about 6-12 inches above a pot of boiling water for a good 5-10 minutes while you heat up your press. Let it the steam hydrate the flowers a bit. Press it immediately after and watch the purples drain right out. Rehydrating helps pull some of the pigments out but ideally you just want to press the freshest material you can, although that is obviously a given. Press the rosin again to get a really wild looking white THCA with purple tie-dye