diff --git a/code/WorkInProgress/Chemistry-Holder.dm b/code/WorkInProgress/Chemistry-Holder.dm
index d19db4bd0a9..5c57a0b98f7 100644
--- a/code/WorkInProgress/Chemistry-Holder.dm
+++ b/code/WorkInProgress/Chemistry-Holder.dm
@@ -156,33 +156,42 @@ datum
 			handle_reactions()
 				if(my_atom.flags & NOREACT) return //Yup, no reactions here. No siree.
 
-				for(var/A in typesof(/datum/chemical_reaction) - /datum/chemical_reaction)
-					var/datum/chemical_reaction/C = new A()
-					var/total_required_reagents = C.required_reagents.len
-					var/total_matching_reagents = 0
-					var/list/multipliers = new/list()
+				var/reaction_occured = 0
+				do
+					reaction_occured = 0
+					for(var/A in typesof(/datum/chemical_reaction) - /datum/chemical_reaction)
+						var/datum/chemical_reaction/C = new A()
+						var/total_required_reagents = C.required_reagents.len
+						var/total_matching_reagents = 0
+						var/total_required_catalysts = C.required_catalysts.len
+						var/total_matching_catalysts= 0
+						var/list/multipliers = new/list()
 
-					for(var/B in C.required_reagents)
-						if(has_reagent(B, C.required_reagents[B]))
-							total_matching_reagents++
-							multipliers += round(get_reagent_amount(B) / C.required_reagents[B])
-
-					if(total_matching_reagents == total_required_reagents)
-						var/multiplier = min(multipliers)
 						for(var/B in C.required_reagents)
-							del_reagent(B)
+							if(has_reagent(B, C.required_reagents[B]))
+								total_matching_reagents++
+								multipliers += round(get_reagent_amount(B) / C.required_reagents[B])
+						for(var/B in C.required_catalysts)
+							if(has_reagent(B, C.required_catalysts[B]))
+								total_matching_catalysts++
 
-						var/created_volume = C.result_amount*multiplier
-						if(C.result)
-							multiplier = max(multiplier, 1) //this shouldnt happen ...
-							add_reagent(C.result, C.result_amount*multiplier)
+						if(total_matching_reagents == total_required_reagents && total_matching_catalysts == total_required_catalysts)
+							var/multiplier = min(multipliers)
+							for(var/B in C.required_reagents)
+								remove_reagent(B, (multiplier * C.required_reagents[B]), safety = 1)
 
-						for(var/mob/M in viewers(4, get_turf(my_atom)) )
-							M << "\blue \icon[my_atom] The solution begins to bubble."
-						playsound(get_turf(my_atom), 'bubbles.ogg', 80, 1)
+							var/created_volume = C.result_amount*multiplier
+							if(C.result)
+								multiplier = max(multiplier, 1) //this shouldnt happen ...
+								add_reagent(C.result, C.result_amount*multiplier)
 
-						C.on_reaction(src, created_volume)
+							for(var/mob/M in viewers(4, get_turf(my_atom)) )
+								M << "\blue \icon[my_atom] The solution begins to bubble."
+							playsound(get_turf(my_atom), 'bubbles.ogg', 80, 1)
 
+							C.on_reaction(src, created_volume)
+							reaction_occured = 1
+				while(reaction_occured)
 				update_total()
 				return 0
 
diff --git a/code/WorkInProgress/Chemistry-Readme.dm b/code/WorkInProgress/Chemistry-Readme.dm
index 4d74421665a..165f025c02f 100644
--- a/code/WorkInProgress/Chemistry-Readme.dm
+++ b/code/WorkInProgress/Chemistry-Readme.dm
@@ -189,6 +189,12 @@ About Recipes:
 			of that reagent. The handle_reaction proc can detect mutiples of the same recipes
 			so for most cases you want to set the required amount to 1.
 
+		required_catalysts (Added May 2011)
+			This is a list of the ids of the required catalysts.
+			Functionally similar to required_reagents, it is a list of reagents that are required
+			for the reaction. However, unlike required_reagents, catalysts are NOT consumed.
+			They mearly have to be present in the container.
+
 		result_amount
 			This is the amount of the resulting reagent this recipe will produce.
 			I recommend you set this to the total volume of all required reagent.
diff --git a/code/WorkInProgress/Chemistry-Recipes.dm b/code/WorkInProgress/Chemistry-Recipes.dm
index 6660a1e809e..ce3a2592949 100644
--- a/code/WorkInProgress/Chemistry-Recipes.dm
+++ b/code/WorkInProgress/Chemistry-Recipes.dm
@@ -5,6 +5,7 @@ datum
 		var/id = null
 		var/result = null
 		var/list/required_reagents = new/list()
+		var/list/required_catalysts = new/list()
 		var/result_amount = 0
 
 		proc
@@ -46,7 +47,7 @@ datum
 			name = "Sterilizine"
 			id = "sterilizine"
 			result = "sterilizine"
-			required_reagents = list("ethanol" = 1, "anti-toxin" = 1, "chlorine" = 1)
+			required_reagents = list("ethanol" = 1, "anti_toxin" = 1, "chlorine" = 1)
 			result_amount = 3
 
 		inaprovaline
@@ -497,7 +498,8 @@ datum
 			name = "Tofu"
 			id = "tofu"
 			result = null
-			required_reagents = list("soymilk" = 10, "enzyme" = 2)
+			required_reagents = list("soymilk" = 10)
+			required_catalysts = list("enzyme" = 5)
 			result_amount = 1
 			on_reaction(var/datum/reagents/holder, var/created_volume)
 				var/location = get_turf(holder.my_atom)
@@ -516,27 +518,14 @@ datum
 			name = "Cheesewheel"
 			id = "cheesewheel"
 			result = null
-			required_reagents = list("milk" = 40, "enzyme" = 2)
+			required_reagents = list("milk" = 40)
+			required_catalysts = list("enzyme" = 5)
 			result_amount = 1
 			on_reaction(var/datum/reagents/holder, var/created_volume)
 				var/location = get_turf(holder.my_atom)
 				new /obj/item/weapon/reagent_containers/food/snacks/sliceable/cheesewheel(location)
 				return
 
-		icetea
-			name = "Iced Tea"
-			id = "icetea"
-			result = "icetea"
-			required_reagents = list("ice" = 1, "tea" = 3)
-			result_amount = 4
-
-		icecoffee
-			name = "Iced Coffee"
-			id = "icecoffee"
-			result = "icecoffee"
-			required_reagents = list("ice" = 1, "coffee" = 3)
-			result_amount = 4
-
 		hot_ramen
 			name = "Hot Ramen"
 			id = "hot_ramen"
@@ -554,34 +543,51 @@ datum
 
 ////////////////////////////////////////// COCKTAILS //////////////////////////////////////
 
+		icetea
+			name = "Iced Tea"
+			id = "icetea"
+			result = "icetea"
+			required_reagents = list("ice" = 1, "tea" = 3)
+			result_amount = 4
+
+		icecoffee
+			name = "Iced Coffee"
+			id = "icecoffee"
+			result = "icecoffee"
+			required_reagents = list("ice" = 1, "coffee" = 3)
+			result_amount = 4
+
 		moonshine
 			name = "Moonshine"
 			id = "moonshine"
 			result = "moonshine"
-			required_reagents = list("nutriment" = 10, "enzyme" = 2)
+			required_reagents = list("nutriment" = 10)
+			required_catalysts = list("enzyme" = 5)
 			result_amount = 5
 
 		wine
 			name = "Wine"
 			id = "wine"
 			result = "wine"
-			required_reagents = list("berryjuice" = 10, "enzyme" = 2)
+			required_reagents = list("berryjuice" = 10)
+			required_catalysts = list("enzyme" = 5)
 			result_amount = 5
 
 		vodka
 			name = "Vodka"
 			id = "vodka"
 			result = "vodka"
-			required_reagents = list("potato" = 10, "enzyme" = 2)
+			required_reagents = list("potato" = 10)
+			required_catalysts = list("enzyme" = 5)
 			result_amount = 5
 
 		kahlua
 			name = "Kahlua"
 			id = "kahlua"
 			result = "kahlua"
-			required_reagents = list("coffee" = 5, "sugar" = 5, "enzyme" = 2)
-
-
+			required_reagents = list("coffee" = 5, "sugar" = 5)
+			required_catalysts = list("enzyme" = 5)
+			result_amount = 5
 
 		gin_tonic
 			name = "Gin and Tonic"