Explode proc set up

code/modules/reagents/chemistry/recipes.dm

@@ -18,7 +18,6 @@
 	var/mix_sound = 'sound/effects/bubbles.ogg' //The sound played upon mixing, if applicable
 
 	//FermiChem!
-
 	var/OptimalTempMin = 200 // Lower area of bell curve for determining heat based rate reactions
 	var/OptimalTempMax = 800
 	var/ExplodeTemp = 900 //If any reaction is this hot, it explodes!
@@ -34,9 +33,7 @@
 	var/RateUpLim = 10
 	var/FermiChem = FALSE //If the chemical uses the Fermichem reaction mechanics
 	var/FermiExplode = FALSE //If the chemical explodes in a special way as a result of
-	var/ImpureChem = "toxin" //What chemical is produced with an inpure reaction
-	var/InverseChemVal = 0.3
-	var/InverseChem = "toxin"
+	var/PurityMin =	0.15 //If purity is below 0.15, it explodes too. Set to 0 to disable this.
 
 
 /datum/chemical_reaction/proc/on_reaction(datum/reagents/holder, created_volume, specialreact)