Rusty

“The Aurora!"
Her wonder was so strong that she had to clutch the rail to keep from falling.
The sight filled the northern sky; the immensity of it was scarcely conceivable. As if from Heaven itself, great curtains of delicate light hung and trembled. Pale green and rose-pink, and as transparent as the most fragile fabric, and at the bottom edge a profound and fiery crimson like the fires of Hell, they swung and shimmered loosely with more grace than the most skillful dancer. Lyra thought she could even hear them: a vast distant whispering swish. In the evanescent delicacy she felt something as profound as she'd felt close to the bear. She was moved by it: it was so beautiful it was almost holy; she felt tears prick her eyes, and the tears splintered the light even further into prismatic rainbows.”
― Philip Pullman, Northern Lights