diff --git a/code/__HELPERS/game.dm b/code/__HELPERS/game.dm
index 119a28f22a7..10889abf2e5 100644
--- a/code/__HELPERS/game.dm
+++ b/code/__HELPERS/game.dm
@@ -435,6 +435,34 @@ datum/projectile_data
 	var/b = mixOneColor(weights, blues)
 	return rgb(r,g,b)
 
+/proc/mixOneColor(var/list/weight, var/list/color)
+	if (!weight || !color || length(weight)!=length(color))
+		return 0
+
+	var/contents = length(weight)
+	var/i
+
+	//normalize weights
+	var/listsum = 0
+	for(i=1; i<=contents; i++)
+		listsum += weight[i]
+	for(i=1; i<=contents; i++)
+		weight[i] /= listsum
+
+	//mix them
+	var/mixedcolor = 0
+	for(i=1; i<=contents; i++)
+		mixedcolor += weight[i]*color[i]
+	mixedcolor = round(mixedcolor)
+
+	//until someone writes a formal proof for this algorithm, let's keep this in
+//	if(mixedcolor<0x00 || mixedcolor>0xFF)
+//		return 0
+	//that's not the kind of operation we are running here, nerd
+	mixedcolor=min(max(mixedcolor,0),255)
+
+	return mixedcolor
+
 /**
 * Gets the highest and lowest pressures from the tiles in cardinal directions
 * around us, then checks the difference.
diff --git a/code/game/machinery/iv_drip.dm b/code/game/machinery/iv_drip.dm
index 63ad92f017d..658686d9533 100644
--- a/code/game/machinery/iv_drip.dm
+++ b/code/game/machinery/iv_drip.dm
@@ -32,7 +32,7 @@
 				if(80 to 90)	filling.icon_state = "reagent80"
 				if(91 to INFINITY)	filling.icon_state = "reagent100"
 
-			filling.icon += mix_color_from_reagents(reagents.reagent_list)
+			filling.icon += reagents.get_color()
 			overlays += filling
 
 /obj/machinery/iv_drip/MouseDrop(over_object, src_location, over_location)
diff --git a/code/game/objects/effects/chemsmoke.dm b/code/game/objects/effects/chemsmoke.dm
index 6f68d2a14fb..bbcded9a11b 100644
--- a/code/game/objects/effects/chemsmoke.dm
+++ b/code/game/objects/effects/chemsmoke.dm
@@ -155,7 +155,7 @@
 
 
 	//build smoke icon
-	var/color = mix_color_from_reagents(chemholder.reagents.reagent_list)
+	var/color = chemholder.reagents.get_color()
 	var/icon/I
 	if(color)
 		I = icon('icons/effects/chemsmoke.dmi')
diff --git a/code/modules/reagents/Chemistry-Colours.dm b/code/modules/reagents/Chemistry-Colours.dm
index a59147e85f6..501b1ac475b 100644
--- a/code/modules/reagents/Chemistry-Colours.dm
+++ b/code/modules/reagents/Chemistry-Colours.dm
@@ -1,66 +1,23 @@
-/proc/mix_color_from_reagents(var/list/reagent_list)
-	if(!reagent_list || !length(reagent_list))
-		return 0
+/datum/reagents/proc/get_color()
+	if(!reagent_list || !reagent_list.len)
+		return "#ffffffff"
+	if(reagent_list.len == 1) // It's pretty common and saves a lot of work
+		var/datum/reagent/R = reagent_list[1]
+		return R.color
 
-	var/contents = length(reagent_list)
-	var/list/weight = new /list(contents)
-	var/list/redcolor = new /list(contents)
-	var/list/greencolor = new /list(contents)
-	var/list/bluecolor = new /list(contents)
-	var/i
+	var/list/colors = list(0, 0, 0, 0)
+	var/tot_w = 0
+	for(var/datum/reagent/R in reagent_list)
+		var/hex = uppertext(R.color)
+		if(length(hex) == 7)
+			hex += "FF"
+		if(length(hex) != 9) // PANIC PANIC PANIC
+			warning("Reagent [R.id] has an incorrect color set ([R.color])")
+			hex = "#FFFFFFFF"
+		colors[1] += hex2num(copytext(hex, 2, 4)) * R.volume * R.color_weight
+		colors[2] += hex2num(copytext(hex, 4, 6)) * R.volume * R.color_weight
+		colors[3] += hex2num(copytext(hex, 6, 8)) * R.volume * R.color_weight
+		colors[4] += hex2num(copytext(hex, 8, 10)) * R.volume * R.color_weight
+		tot_w += R.volume * R.color_weight
 
-	//fill the list of weights
-	for(i=1; i<=contents; i++)
-		var/datum/reagent/re = reagent_list[i]
-		var/reagentweight = re.volume
-		if(istype(re, /datum/reagent/paint))
-			reagentweight *= 20 //Paint colours a mixture twenty times as much
-		weight[i] = reagentweight
-
-
-	//fill the lists of colours
-	for(i=1; i<=contents; i++)
-		var/datum/reagent/re = reagent_list[i]
-		var/hue = re.color
-		if(length(hue) != 7)
-			return 0
-		redcolor[i]=hex2num(copytext(hue,2,4))
-		greencolor[i]=hex2num(copytext(hue,4,6))
-		bluecolor[i]=hex2num(copytext(hue,6,8))
-
-	//mix all the colors
-	var/red = mixOneColor(weight,redcolor)
-	var/green = mixOneColor(weight,greencolor)
-	var/blue = mixOneColor(weight,bluecolor)
-
-	//assemble all the pieces
-	var/finalcolor = rgb(red, green, blue)
-	return finalcolor
-
-/proc/mixOneColor(var/list/weight, var/list/color)
-	if (!weight || !color || length(weight)!=length(color))
-		return 0
-
-	var/contents = length(weight)
-	var/i
-
-	//normalize weights
-	var/listsum = 0
-	for(i=1; i<=contents; i++)
-		listsum += weight[i]
-	for(i=1; i<=contents; i++)
-		weight[i] /= listsum
-
-	//mix them
-	var/mixedcolor = 0
-	for(i=1; i<=contents; i++)
-		mixedcolor += weight[i]*color[i]
-	mixedcolor = round(mixedcolor)
-
-	//until someone writes a formal proof for this algorithm, let's keep this in
-//	if(mixedcolor<0x00 || mixedcolor>0xFF)
-//		return 0
-	//that's not the kind of operation we are running here, nerd
-	mixedcolor=min(max(mixedcolor,0),255)
-
-	return mixedcolor
+	return rgb(colors[1] / tot_w, colors[2] / tot_w, colors[3] / tot_w, colors[4] / tot_w)
\ No newline at end of file
diff --git a/code/modules/reagents/Chemistry-Holder.dm b/code/modules/reagents/Chemistry-Holder.dm
index a0ff92aad2a..eca291deed0 100644
--- a/code/modules/reagents/Chemistry-Holder.dm
+++ b/code/modules/reagents/Chemistry-Holder.dm
@@ -470,47 +470,9 @@ datum
 
 					var/datum/reagent/R = A
 					if (R.id == reagent)
+						R.on_merge(data, amount)
 						R.volume += amount
 						update_total()
-
-						// mix dem viruses
-						if(R.id == "blood" && reagent == "blood")
-							if(R.data && data)
-
-								if(R.data["viruses"] || data["viruses"])
-
-									var/list/mix1 = R.data["viruses"]
-									var/list/mix2 = data["viruses"]
-
-									// Stop issues with the list changing during mixing.
-									var/list/to_mix = list()
-
-									for(var/datum/disease/advance/AD in mix1)
-										to_mix += AD
-									for(var/datum/disease/advance/AD in mix2)
-										to_mix += AD
-
-									var/datum/disease/advance/AD = Advance_Mix(to_mix)
-									if(AD)
-										var/list/preserve = list(AD)
-										for(var/D in R.data["viruses"])
-											if(!istype(D, /datum/disease/advance))
-												preserve += D
-										R.data["viruses"] = preserve
-						if(R.id == "paint" && reagent == "paint")
-							if(R.color && data)
-								var/list/mix = new /list(2)
-								//fill the list
-								var/datum/reagent/paint/P = chemical_reagents_list["paint"]
-								var/datum/reagent/paint/P1 = new P.type()
-								P1.color = R.color
-								P1.volume = R.volume - amount //since we just increased that
-								var/datum/reagent/paint/P2 = new P.type()
-								P2.color = data
-								P2.volume = amount
-								mix[1] = P1
-								mix[2] = P2
-								R.color = mix_color_from_reagents(mix)
 						if(!safety)
 							handle_reactions()
 						my_atom.on_reagent_change()
diff --git a/code/modules/reagents/Chemistry-Reagents.dm b/code/modules/reagents/Chemistry-Reagents.dm
index 560b0c8bff3..c7c79d5772a 100644
--- a/code/modules/reagents/Chemistry-Reagents.dm
+++ b/code/modules/reagents/Chemistry-Reagents.dm
@@ -27,7 +27,8 @@ datum
 		var/glass_desc = null
 		var/glass_center_of_mass = null
 		//var/list/viruses = list()
-		var/color = "#000000" // rgb: 0, 0, 0 (does not support alpha channels - yet!)
+		var/color = "#000000" // rgb: 0, 0, 0, 0 - supports alpha channels
+		var/color_weight = 1
 
 		proc
 			reaction_mob(var/mob/M, var/method=TOUCH, var/volume) //By default we have a chance to transfer some
@@ -89,7 +90,7 @@ datum
 				return
 
 			// Called when two reagents of the same are mixing. <-- Blatant lies
-			on_merge(var/data)
+			on_merge(var/newdata, var/newamount)
 				return
 
 			on_update(var/atom/A)
@@ -135,9 +136,32 @@ datum
 					var/mob/living/carbon/C = M
 					C.antibodies |= self.data["antibodies"]
 
-			on_merge(var/data)
-				if(data["blood_colour"])
-					color = data["blood_colour"]
+			on_merge(var/newdata, var/newamount)
+				if(!data || !newdata)
+					return
+				if(newdata["blood_colour"])
+					color = newdata["blood_colour"]
+				if(data && newdata)
+					if(data["viruses"] || newdata["viruses"])
+
+						var/list/mix1 = data["viruses"]
+						var/list/mix2 = newdata["viruses"]
+
+						// Stop issues with the list changing during mixing.
+						var/list/to_mix = list()
+
+						for(var/datum/disease/advance/AD in mix1)
+							to_mix += AD
+						for(var/datum/disease/advance/AD in mix2)
+							to_mix += AD
+
+						var/datum/disease/advance/AD = Advance_Mix(to_mix)
+						if(AD)
+							var/list/preserve = list(AD)
+							for(var/D in data["viruses"])
+								if(!istype(D, /datum/disease/advance))
+									preserve += D
+							data["viruses"] = preserve
 				return ..()
 
 			on_update(var/atom/A)
@@ -204,7 +228,7 @@ datum
 			id = "water"
 			description = "A ubiquitous chemical substance that is composed of hydrogen and oxygen."
 			reagent_state = LIQUID
-			color = "#0064C8" // rgb: 0, 100, 200
+			color = "#0064C877" // rgb: 0, 100, 200
 			custom_metabolism = 0.01
 
 			glass_icon_state = "glass_clear"
@@ -1593,6 +1617,11 @@ datum
 			reagent_state = LIQUID
 			color = "#808080"
 			overdose = 15
+			color_weight = 20
+
+			New()
+				..()
+				data = color
 
 			reaction_turf(var/turf/T, var/volume)
 				..()
@@ -1610,6 +1639,35 @@ datum
 					//painting ghosts: not allowed
 					M.color = color
 
+			on_merge(var/newdata, var/newamount)
+				if(!data || !newdata)
+					return
+				var/list/colors = list(0, 0, 0, 0)
+				var/tot_w = 0
+
+				var/hex1 = uppertext(color)
+				var/hex2 = uppertext(newdata)
+				if(length(hex1) == 7)
+					hex1 += "FF"
+				if(length(hex2) == 7)
+					hex2 += "FF"
+				if(length(hex1) != 9 || length(hex2) != 9)
+					return
+				colors[1] += hex2num(copytext(hex1, 2, 4)) * volume
+				colors[2] += hex2num(copytext(hex1, 4, 6)) * volume
+				colors[3] += hex2num(copytext(hex1, 6, 8)) * volume
+				colors[4] += hex2num(copytext(hex1, 8, 10)) * volume
+				tot_w += volume
+				colors[1] += hex2num(copytext(hex2, 2, 4)) * newamount
+				colors[2] += hex2num(copytext(hex2, 4, 6)) * newamount
+				colors[3] += hex2num(copytext(hex2, 6, 8)) * newamount
+				colors[4] += hex2num(copytext(hex2, 8, 10)) * newamount
+				tot_w += newamount
+
+				color = rgb(colors[1] / tot_w, colors[2] / tot_w, colors[3] / tot_w, colors[4] / tot_w)
+				data = color
+				return
+
 
 //////////////////////////Poison stuff///////////////////////
 
diff --git a/code/modules/reagents/reagent_containers/glass.dm b/code/modules/reagents/reagent_containers/glass.dm
index 3ff13c7c1b3..fba5d8ac39c 100644
--- a/code/modules/reagents/reagent_containers/glass.dm
+++ b/code/modules/reagents/reagent_containers/glass.dm
@@ -195,7 +195,7 @@
 				if(80 to 90)	filling.icon_state = "[icon_state]80"
 				if(91 to INFINITY)	filling.icon_state = "[icon_state]100"
 
-			filling.color = mix_color_from_reagents(reagents.reagent_list)
+			filling.color = reagents.get_color()
 			overlays += filling
 
 		if (!is_open_container())
diff --git a/code/modules/reagents/reagent_containers/glass/bottle.dm b/code/modules/reagents/reagent_containers/glass/bottle.dm
index ab01d11eafb..cbfea73a94a 100644
--- a/code/modules/reagents/reagent_containers/glass/bottle.dm
+++ b/code/modules/reagents/reagent_containers/glass/bottle.dm
@@ -48,7 +48,7 @@
 				if(80 to 90)	filling.icon_state = "[icon_state]-80"
 				if(91 to INFINITY)	filling.icon_state = "[icon_state]-100"
 
-			filling.color = mix_color_from_reagents(reagents.reagent_list)
+			filling.color = reagents.get_color()
 			overlays += filling
 
 		if (!is_open_container())
diff --git a/code/modules/reagents/reagent_containers/spray.dm b/code/modules/reagents/reagent_containers/spray.dm
index 1978071e0dc..2e929c6d12d 100644
--- a/code/modules/reagents/reagent_containers/spray.dm
+++ b/code/modules/reagents/reagent_containers/spray.dm
@@ -67,7 +67,7 @@
 		var/obj/D = new/obj()
 		D.create_reagents(amount_per_transfer_from_this)
 		reagents.trans_to(D, amount_per_transfer_from_this)
-		D.icon += mix_color_from_reagents(D.reagents.reagent_list)
+		D.icon += D.reagents.get_color()
 		spawn(0)
 			D.reagents.reaction(A)
 			sleep(5)
@@ -76,7 +76,7 @@
 		var/obj/effect/decal/chempuff/D = new/obj/effect/decal/chempuff(get_turf(src))
 		D.create_reagents(amount_per_transfer_from_this)
 		reagents.trans_to(D, amount_per_transfer_from_this, 1/spray_size)
-		D.icon += mix_color_from_reagents(D.reagents.reagent_list)
+		D.icon += D.reagents.get_color()
 
 		var/turf/A_turf = get_turf(A)//BS12
 
@@ -204,7 +204,7 @@
 		D.create_reagents(amount_per_transfer_from_this)
 		src.reagents.trans_to(D, amount_per_transfer_from_this)
 
-		D.icon += mix_color_from_reagents(D.reagents.reagent_list)
+		D.icon += D.reagents.get_color()
 
 		Sprays[i] = D
 
diff --git a/code/modules/reagents/reagent_containers/syringes.dm b/code/modules/reagents/reagent_containers/syringes.dm
index e5d2933e35a..9b2eee7d65e 100644
--- a/code/modules/reagents/reagent_containers/syringes.dm
+++ b/code/modules/reagents/reagent_containers/syringes.dm
@@ -222,7 +222,7 @@
 
 			filling.icon_state = "syringe[rounded_vol]"
 
-			filling.color = mix_color_from_reagents(reagents.reagent_list)
+			filling.color = reagents.get_color()
 			overlays += filling