Patient wants to change the color! How to change acrylic color on a retainer.

Patient wants to change the color on her retainers. Not sure if they ordered the wrong color in the first place or she didn't like it when she saw it?
This video will show the simple steps to take to replace the acrylic on an already finished retainer!
Things I order from my lab on Amazon: https://www.amazon.com/shop/retainerdesigner