TO TEST - also needs #9099 merging.

code/modules/reagents/chemistry/holder.dm

@@ -880,10 +880,8 @@
 			if(my_atom)
 				my_atom.on_reagent_change(ADD_REAGENT)
 			if(isliving(my_atom))
-				if(R.OnMobMergeCheck == TRUE)//Forces on_mob_add proc when a chem is merged
+				if(R.reagentFlags & REAGENT_ONMOBMERGE)//Forces on_mob_add proc when a chem is merged
 					R.on_mob_add(my_atom, amount)
-				//else
-				//	R.on_merge(data, amount, my_atom, other_purity)
 			R.on_merge(data, amount, my_atom, other_purity)
 			if(!no_react)
 				handle_reactions()
@@ -901,7 +899,7 @@
 	if(data)
 		R.data = data
 		R.on_new(data)
-	if(R.addProc == TRUE)//Allows on new without data overhead.
+	if(R.reagentFlags & REAGENT_FORCEONNEW)//Allows on new without data overhead.
 		R.on_new(pH) //Add more as desired.
 
 

code/modules/reagents/chemistry/reagents.dm

@@ -32,19 +32,23 @@
 	var/addiction_stage3_end = 30
 	var/addiction_stage4_end = 40
 	var/overdosed = 0 // You fucked up and this is now triggering its overdose effects, purge that shit quick.
-	var/self_consuming = FALSE
+	var/self_consuming = FALSE  //I think this uhhh, makes weird stuff happen when metabolising, but... doesn't seem to do what I think, so I'm gonna leave it.
 	//Fermichem vars:
 	var/purity = 1 						//How pure a chemical is from 0 - 1.
-	var/addProc = FALSE 				//If the chemical should force an on_new() call
 	var/turf/loc = null 				//Should be the creation location!
 	var/pH = 7							//pH of the specific reagent, used for calculating the sum pH of a holder.
 	var/ImpureChem 			= "fermiTox"// What chemical is metabolised with an inpure reaction
 	var/InverseChemVal 		= 0.25		// If the impurity is below 0.5, replace ALL of the chem with InverseChem upon metabolising
 	var/InverseChem 		= "fermiTox"// What chem is metabolised when purity is below InverseChemVal, this shouldn't be made, but if it does, well, I guess I'll know about it.
-	var/DoNotSplit			= FALSE		// If impurity is handled within the main chem itself
-	var/OnMobMergeCheck 	= FALSE 	//Call on_mob_life proc when reagents are merging.
 	var/metabolizing = FALSE
-	var/invisible = FALSE //Set to true if it doesn't appear on handheld health analyzers.
+	var/reagentFlags //REAGENT_DEAD_PROCESS, REAGENT_DONOTSPLIT, REAGENT_ONLYINVERSE, REAGENT_ONMOBMERGE, REAGENT_INVISIBLE, REAGENT_FORCEONNEW, REAGENT_SNEAKYNAME
+	//REAGENT_DEAD_PROCESS  Calls on_mob_dead() if present in a dead body
+	//REAGENT_DONOTSPLIT	Do not split the chem at all during processing
+	//REAGENT_ONLYINVERSE	Only invert chem, no splitting
+	//REAGENT_ONMOBMERGE	Call on_mob_life proc when reagents are merging.
+	//REAGENT_INVISIBLE		Doesn't appear on handheld health analyzers.
+	//REAGENT_FORCEONNEW	Forces a on_new() call without a data overhead
+	//REAGENT_SNEAKYNAME    When metabolised it takes the name of the splitting chem
 
 /datum/reagent/Destroy() // This should only be called by the holder, so it's already handled clearing its references
 	. = ..()
@@ -73,6 +77,15 @@
 		holder.remove_reagent(src.id, metabolization_rate * M.metabolism_efficiency) //By default it slowly disappears.
 	return
 
+//called when a mob processes chems when dead.
+/datum/reagent/proc/on_mob_death(mob/living/carbon/M)
+	if(!(reagentFlags & REAGENT_DEAD_PROCESS)) //justincase
+		return
+	current_cycle++
+	if(holder)
+		holder.remove_reagent(src.id, metabolization_rate * M.metabolism_efficiency) //By default it slowly disappears.
+	return
+
 // Called when this reagent is first added to a mob
 /datum/reagent/proc/on_mob_add(mob/living/L)
 	return

code/modules/reagents/chemistry/reagents/other_reagents.dm

@@ -2003,7 +2003,7 @@
 	can_synth = FALSE
 	var/datum/dna/original_dna
 	var/reagent_ticks = 0
-	invisible = TRUE
+	reagentFlags = REAGENT_INVISIBLE
 
 /datum/reagent/changeling_string/on_mob_metabolize(mob/living/carbon/C)
 	if(C && C.dna && data["desired_dna"])