|Acid dissolve rate||0.1%|
Represents the absence of a particle. A theoretical particle with the ID "NONE" appears in the source code. If a transition changes the type of a particle to NONE, it is more simply explained as the particle disappearing. NONE can be drawn, but it acts as an eraser and will always replace existing particles.
Old TPT console commands also use "none" to represent a non-existing particle. Commands such as "!set type dmnd none" removes all DMND particles from the playfield.