Void Salt

Void Salt is a material made from the Alchemy Machine that can be used in brewing potions. It is a rather unique material that is held within a metal container. When dragging the container above the cauldron, numerous pieces at a time fall out into the broth. Ten thousand pieces of Void Salt are made from one crafting in the Alchemy Machine. Void Salt cannot be ground in the Mortar and Pestle. Instead, it has a special effect of erasing the path drawn by ingredients already in the cauldron. 
The obvious application from this effect is to erase mistakes with it, perhaps an alchemist added an ingredient in error, or (less egregiously) accidentally added an ingredient that was ground down too much; in such cases, using the void salt would be one way the alchemist can utilize to save their potion.
Note however that, If saved, the usage of Void Salt will be recorded in the recipe. So using the Void Salt as a means to remove mistake is heavily discouraged in non-one-off potions.
A less obvious usage of the void salt is to utilize it as a "reverse Mortar and Pestle", thus allowing the usage of alternate ingredients to draw a path that would normally require ingredients that is short in supply. For example. an alchemist may wish to draw a path going in the SW direction in the alchemy map, but is unable or unwilling to expend ingredients such as Terraria (which goes south) and Firebell (which goes west). If said alchemist has instead a surplus of brown mushrooms and Void salts then they could instead of one unit of brown mushrooms (which goes west then south then east if un-ground), and about 200 grains of Void Salt to draw a path leading to the SW direction.
Considering the length and costs an alchemist need to go through to acquire 5000 grains of Void Salt, the fact that 400 grains are needed to completely erase the path of an un-ground Terraria, and that its usage appears to be mostly unneeded, one could reasonably conclude the Void salt isn't exactly the most practical of alchemical ingredients.
==Recipe==
== Notes ==
*As keen alchemists may note, the use of Void Salt is almost entirely limited to undoing accidents, most of which should be prevented by the use of the recipe book. The full capability of Void Salt may not be obvious yet in the playtest.
*When created, Void Salt will consume Nigredo, meaning you will have to create another one if you want to create Albedo. This goes for all other legendary recipes and their respective Ingredients (I.E. Albedo will consume Nigredo and Moon Salt will consume Albedo)
== Old Recipes ==
File:Void Salt Map v1.0.jpg|v1.0
Category:Alchemy Machine
ru:Соль пустоты
Category:Salts