Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
|"Harry, your eyesight really is awful."
The title of this article is transcribed from an image. Due to several factors, including poor image quality and difficult-to-read fonts/handwriting, it may have been transcribed incorrectly. If you have a higher quality version of the source image, or a more accurate reading of the text, please visit this article's talk page.
Sum-solving ink was a type of ink that presumably helped solve math problems. Luna Lovegood owned a bottle of turquoise sum-solving ink, but someone took it from her and hid it during the 1995-1996 school year, prompting her to post a notice asking for the return of it and several other missing possessions.
- Harry Potter and the Order of the Phoenix (film) (Mentioned on a poster)
- Harry Potter Film Wizardry (Mentioned on a poster)