Objective: To dye the frosting for the lego brownies

Which of the following solutions is more sound in terms of naive physics reasoning?

Options: [-] Separate the frosting in to separate containers for each color and use food gel for a more vibrant color [-] Put the frosting in to a container and use food gel for a more vibrant color mixing all the wanted colors together
Separate the frosting in to separate containers for each color and use food gel for a more vibrant color