thick black potion brew

[Atwell]

The web site 'Magical Brews' page has this brew:

Thick Black Potion
* Sliver of Darkness
* Chunk of Ice
* Calabash Gourd
* Leah (AH)

I wanted to brew this, but this cp list seems incomplete. I tried to brew with all of these items in inventory:

a calabash drinking gourd <-- from datura-tribeswoman
a sliver of darkness <-- from gort
a sliver of darkness <-- from crowley
a chunk of ice [2] <-- from ice-gargoyle
a chunk of ice..It has a soft glowing aura! <-- from fish-cook
a chunk of glowing ice..It has a soft glowing aura! <-- from icy-boy

Has anyone seen a note describing this brew, or brewed it in the past?