At least some content in this article is derived from information featured in Fantastic Beasts and Where to Find Them (film). As such, spoilers will be present within the article.
Shell Shiner was a magical ointment intended for shining the shells of magical beasts including Fire crabs, Mackled Malaclaws, and Streelers. Its ingredients included dittany, wormwood, and salt water. Its only required a few drops per dose, but should not be used on new born beasts.