A quill is a writing instrument made from a feather whose tip has been cut into a pointed shape. It is the standard writing instrument in the Wizarding world, as opposed to pens and pencils in the Muggle world. They usually have to be dipped into ink. There is a great variety of quills, some plain and simple, some (like Fwooper quills), more fancy-looking, others enhanced with magical properties.
Numerous types of feathers are used including Pheasant, Eagle, Peacock (Gilderoy Lockhart's favourite), and perhaps Phoenix. Augurey feathers, however, are no good for this purpose as they repel ink.
This quill does not use ink, but uses the writer's own blood to mark the paper. Harry had to use this quill to write lines in 1995 while serving detentions with Professor Umbridge. His hand is now permanently scarred with I must not tell lies from writing with this quill. Lee Jordan also was forced to use this quill for joking about a rule Professor Umbridge imposed.
Detects the birth of each wizard or witch, then writes his or her name down in a large parchment book at Hogwarts. The Deputy Head checks the book every year, and then sends owls to these children as they approach their eleventh birthdays to invite them to attend Hogwarts.
Corrects the user's spelling, sold at Weasleys' Wizard Wheezes. Ron Weasley had one, but its charm wore off leaving his homework terribly misspelt (example: his name was written as Roonil Wazlib.)
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