diff --git a/mods/clf3.js b/mods/clf3.js
new file mode 100644
index 00000000..d9facdbf
--- /dev/null
+++ b/mods/clf3.js
@@ -0,0 +1,86 @@
+var modName = "mods/clf3.js";
+var chemMod = "mods/chem.js";
+
+if(enabledMods.includes(chemMod)) {
+	function finishBurn(pixel) {
+		var info = elements[pixel.element];
+
+		var burnInto = info.burnInto;
+		if (burnInto == undefined) {
+			burnInto = 'fire';
+		}
+		else if (burnInto instanceof Array) {
+			burnInto = burnInto[Math.floor(Math.random()*burnInto.length)];
+		}
+		changePixel(pixel,burnInto,(burnInto !== "smoke"));
+		if (info.fireColor != undefined && burnInto == "fire") {
+			pixel.color = pixelColorPick(pixel,info.fireColor);
+		}
+		else {
+			pixel.color = pixelColorPick(pixel)
+		}
+	};
+
+	function clf3Tick(pixel) {
+		for(i = 0; i < adjacentCoords.length; i++) {
+			var oX = adjacentCoords[i][0];
+			var oY = adjacentCoords[i][1];
+			var fX = pixel.x+oX;
+			var fY = pixel.y+oY;
+			if(!isEmpty(fX,fY,true)) {
+				var otherPixel = pixelMap[fX][fY];
+				var otherElement = otherPixel.element;
+				if(otherElement === "water") {
+					explodeAt(otherPixel.x,otherPixel.y,7,"fire,hydrofluoric_acid,oxygen,acid,chlorine")
+				};
+				if(!elements.chlorine_trifluoride.ignore.includes(otherElement)) {
+					if(!otherPixel.burning) { otherPixel.burning = true };
+					if(!otherPixel.burnStart) { otherPixel.burnStart = pixelTicks };
+					var instaburnChance = 0.05 + (pixelTicks - otherPixel.burnStart) / 1000
+					if(Math.random() < instaburnChance) {
+						finishBurn(otherPixel);
+					};
+				};
+			};
+		};
+	};
+
+	var clf3IgnoreList = ["FOOF","solid_FOOF","oxygen","liquid_oxygen","oxygen_ice","chlorine","liquid_chlorine","liquid_hydrogen_fluoride","liquid_fluorine","fluorine","fluorine_ice","hydrogen_fluoride","hydrofluoric_acid","hydrofluoric_acid_gas","fire","acid_gas","neutral_acid","acid","acid_cloud","nitrogen","helium","neon","argon","krypton","xenon","radon","wall","chlorine_trifluoride","chlorine_trifluoride_ice","chlorine_trifluoride_gas","quartz"];
+
+	//todo: PTFE, passivation
+
+	elements.chlorine_trifluoride = {
+		color: "#8aa65b",
+		behavior: behaviors.LIQUID,
+		//ignore list copied from chem.js
+		ignore: clf3IgnoreList, //the elements that don't exist won't trigger any error here becuase the code's just checking pixels' elements against this list
+		tick: function(pixel) {
+			clf3Tick(pixel);
+		},
+		category:"liquids",
+		state: "liquid",
+		density: 1770,
+		tempLow: -76.34,
+		tempHigh: 11.75,
+		temp: 5,
+	};
+
+	elements.chlorine_trifluoride_gas = {
+		tick: function(pixel) {
+			clf3Tick(pixel);
+		},
+		density: 3.78, //variously or 3.18,
+		//tempHigh: 220, //variously or 180,
+		//stateHigh: ["chlorine_fluoride","fluorine"],
+	};
+
+	elements.chlorine_trifluoride_ice = {
+		tick: function(pixel) {
+			clf3Tick(pixel);
+		},
+	};
+} else {
+	enabledMods.splice(enabledMods.indexOf(modName),0,chemMod);
+	localStorage.setItem("enabledMods", JSON.stringify(enabledMods));
+	alert(`The ${chemMod} mod is required and has been automatically inserted (reload for this to take effect).`);
+};
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