These are used for various Unfired Poison Vials, according to EQTraders.com.
http://www.eqtraders.com/search/reverse_recipe_search.php?item=4845&menustr=035000000000
Unfired Advanced Poison Vial
WT: 0.1 Size: TINY
Class: ALL
Race: ALL
Components: Advanced Vial Sketch, Large Block of Magic Clay, Medium Quality Lion Skin, Purified Water
In: Pottery Wheel, Tanaan Pottery Wheel
Yield: 2 Trivial: 196
Unfired Lined Poison Vial
WT: 0.1 Size: TINY
Class: NONE
Race: ALL
Components: Lined Vial Sketch, Medium Quality Lion Skin, Small Block of Clay, Water Flask
In: Pottery Wheel, Tanaan Pottery Wheel
Yield: 1 Trivial: 168
Unfired Poison Vial
WT: 0.1 Size: TINY
Class: NONE
Race: ALL
Components: Medium Quality Lion Skin, Small Block of Clay, Vial Sketch, Water Flask
In: Pottery Wheel, Tanaan Pottery Wheel
Yield: 1 Trivial: 148
Unfired Sealed Poison Vial
WT: 0.1 Size: TINY
Class: NONE
Race: ALL
Components: Medium Quality Lion Skin, Sealed Vial Sketch, Small Block of Clay, Water Flask
In: Pottery Wheel, Tanaan Pottery Wheel
Yield: 1 Trivial: 188