The antonyms for the phrase "becoming colorless" would be brightening, enlivening, and vivifying. These words signify the opposite of becoming dull or faded. When something brightens, it becomes more colorful and vibrant, while enlivening means that something becomes more lively and animated. Vivifying denotes a sense of having new life or vigor restored to something, making it more colorful and full of energy. All of these antonyms signify a return to vibrancy and liveliness, a world of color that is full of exciting possibilities. With a little bit of color, anything can become new again!