I made sulphuric acid by reacting sulphur with oxygen, passing the resulting sulphur dioxide and sulphur trioxide through a flask of water and gently heating it to remove the dissolved volatiles. Unfortunately, it was just a chemistry simulation, but it was quite interesting. The software's numerical model got into some trouble when I tried to evaporate off all the water and the app tends to crash a lot, but I'm still quite impressed with it. Does anyone know where I can get some real sulphur? Fungicide at a garden centre maybe? The stores here all tend to sell complicated and expensive proprietary products, so it's hard to get hold of basic chemicals.