reagent

Vars
fluid_flags	Is it banned from various fluid types, see _std/defines/reagents.dm
initial_metabolized	Has this chem been in the person's bloodstream for at least one cycle?
transparency	Fluids now have colors
Procs
calculate_depletion_rate	This calculates the depletion rate of a chem. In case you want to modify the result of the chems normal depletion rate
get_recipes_in_text	Returns a representation of this reagent's recipes in text form
initial_metabolize	Called once on the first cycle that this chem is processed in the target

Var Details

Is it banned from various fluid types, see _std/defines/reagents.dm

Has this chem been in the person's bloodstream for at least one cycle?

Fluids now have colors

This calculates the depletion rate of a chem. In case you want to modify the result of the chems normal depletion rate

Returns a representation of this reagent's recipes in text form

Called once on the first cycle that this chem is processed in the target