Dust and Mildewe

Dust & Mildewe are wizard publishers. Among their range of titles is The Philosophy of the Mundane: Why the Muggles Prefer Not to Know by Professor Mordicus Egg.

Behind the scenes
These two substances, dust and mildew, would be likely to accumulate on unread and uncared for tomes.

Appearances

 * Fantastic Beasts and Where to Find Them