For a project I need leaves (apple, to be precise) that have turned into their fall colors. The leaves will be pressed later.
Is there a method that creates the color change within a day or two? Or at least a partial change?
I was thinking about placing a branch into the fridge over night and in lukewarm water / a sunny spot during the day. But that's just a stab in the dark based on what induces the change in nature.