Black destabiliser was removed from RuneScape after Update:Player gallery and more bank space.

Black destabiliser

Release date	30 October 2006 (Update)
Removal date	13 November 2006 (Update)
Members?	No
Quest item?	No
Tradeable?	No
Equipable?	No
Stackable?	Yes
High Alch	0 coins
Low Alch	0 coins
Value	1 coin
Destroy	Drop
Store price	Not sold
Examine	A black destabiliser for use in a ghost buster.
Weight	0 kg

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The Black destabiliser was used in the Halloween 2006 event, as the main way of finding and defeating the troublesome ghosts in Diango's Workshop. It was used in a Ghost Buster 500. During the event you would be given more than were able to use. They disappeared when the event finished.

v • d • e 2006 Hallowe'en event
NPCs	Diango • Pixies
Rewards	Skeleton set (Mask, shirt, leggings, gloves, boots) • Jack lantern mask
Related items	Ghost buster 500 • White destabiliser • Red destabiliser • Blue destabiliser • Green destabiliser • Yellow destabiliser • Black destabiliser • Evil roots
Music	High Spirits
Other	Diango's Workshop