icicle, everlasting
These are used as magical Christmas decorations.

• Hung on the bannisters in the castle for Christmas (GF22).

• The Christmas trees in St. Mungo's reception area were covered in magical snow and icicles (OP23).

• See WEATHER.

Ink, Self-Correcting

• Self-Correcting Ink is banned from the examination hall at Hogwarts (OP31).

Invisibility Booster
See BOOSTER, INVISIBILITY.

Invisibility Cloak
See CLOAK, INVISIBILITY.