The Grey Rainbow

She stepped upon the blend deck. Looking around, surrounded by machinery, and eyes. The eyes were watching, waiting, expecting. Just waiting for one slip up. Multiple ponies with clipboards, others observing the blender levels to make sure she put the right amount of ingredients, no more, no less. The machinery daunting, looming, almost as if saying, "We know you're going to mess up. Just do it already." They were almost as bad as the eyes. Almost.

A single pony dressed in a becoming suit stepped out, and handed her a recipe. Upon doing so, he retreated to a room above the blend deck. She reads, reads again, and once more the recipe. After a deep sigh, she proceeds.
Following every step to the T, a perfect rainbow is almost created. All that’s left is to start the blender. A large red button on a user interface attached to the guard rails. Nothing was said by the ponies observing, so she imagines she must've done it correctly, yes? She hits the button. The machine fires up. It fills the air with the most unnatural screech ever heard before by Twister. Her ear drums were pounding.

Peering inside after her ears adjusted, she notices the rainbow beginning to take it’s color. Red, Orange, Yellow, Green, Blue, Indigo, Violet. All in the correct shade, hue, location, and size. Relieved, she leans back on the rail, placing herself not to far from the user interface. The floor is cleaned regularly with chemicals to prevent any rainbow from leaving. Leaving the factory with rainbow, it's recipe, or anything related to is punishable by law. This chemical happens to be highly slippery.

Twister slips after adjusting herself, and presses another button. The blender stops. Being in its delicate stage, it fades gray. Before it can be stopped by the management ponies on the upper balcony, it gets sent out. She watches it slowly trickle down the receiving chute, as if the world was turning slower and slower with each passing second. She frantically looks around for a solution, stumbling over this and that, which proves to be of no avail. She gets up, to find herself being approached by faculty staff. Blank expressions on their face. They say nothing, but she knows what is going to happen next...