Resolves remaining issues with xenohydro PR.

code/modules/reagents/Chemistry-Machinery.dm

@@ -3,8 +3,8 @@
 #define GAS 3
 
 #define CHEM_DISPENSER_ENERGY_COST	0.1	//How many energy points do we use per unit of chemical?
-
 #define BOTTLE_SPRITES list("bottle-1", "bottle-2", "bottle-3", "bottle-4") //list of available bottle sprites
+#define REAGENTS_PER_SHEET 20
 
 /obj/machinery/chem_dispenser
 	name = "chem dispenser"
@@ -827,6 +827,14 @@
 	var/obj/item/weapon/reagent_containers/beaker = null
 	var/limit = 10
 	var/list/holdingitems = list()
+	var/list/sheet_reagents = list(
+		/obj/item/stack/sheet/mineral/iron = "iron",
+		/obj/item/stack/sheet/mineral/uranium = "uranium",
+		/obj/item/stack/sheet/mineral/phoron = "phoron",
+		/obj/item/stack/sheet/mineral/gold = "gold",
+		/obj/item/stack/sheet/mineral/silver = "silver",
+		/obj/item/stack/sheet/mineral/mhydrogen = "hydrogen"
+		)
 
 /obj/machinery/reagentgrinder/New()
 	..()
@@ -857,12 +865,10 @@
 		usr << "The machine cannot hold anymore items."
 		return 1
 
-	//Fill machine with the plantbag!
 	if(!istype(O))
 		return
 
 	if(istype(O,/obj/item/weapon/storage/bag/plants))
-
 		var/failed = 1
 		for (var/obj/item/G in O.contents)
 			if(!O.reagents || !O.reagents.total_volume)
@@ -886,7 +892,7 @@
 		src.updateUsrDialog()
 		return 0
 
-	if(!O.reagents || !O.reagents.total_volume)
+	if(!sheet_reagents[O.type] && (!O.reagents || !O.reagents.total_volume))
 		user << "\The [O] is not suitable for blending."
 		return 1
 
@@ -1008,8 +1014,25 @@
 
 	// Process.
 	for (var/obj/item/O in holdingitems)
-		O.reagents.trans_to(beaker, min(O.reagents.total_volume, (beaker.reagents.maximum_volume - beaker.reagents.total_volume)))
+
+		if(!O || !istype(O))
+			holdingitems -= null
+			continue
+
+		var/remaining_volume = beaker.reagents.maximum_volume - beaker.reagents.total_volume
+		if(sheet_reagents[O.type])
+			var/obj/item/stack/stack = O
+			if(istype(stack))
+				var/amount_to_take = max(0,min(stack.amount,round(remaining_volume/REAGENTS_PER_SHEET)))
+				if(amount_to_take)
+					stack.use(amount_to_take)
+					beaker.reagents.add_reagent(sheet_reagents[stack.type], (amount_to_take*REAGENTS_PER_SHEET))
+					continue
+
+		O.reagents.trans_to(beaker, min(O.reagents.total_volume, remaining_volume))
 		if(O.reagents.total_volume == 0)
 			remove_object(O)
 		if (beaker.reagents.total_volume >= beaker.reagents.maximum_volume)
 			break
+
+#undef REAGENTS_PER_SHEET