Wear eye protection and lab gloves.
Make sure there is nothing flammable near the ignited jelly.
There is a fire risk - a fire extinguisher should be ready.
Always follow general safety
recommendations. Please note that conducting chemistry
experiments you must comply with the relevant legal procedures in
Use an antacid which contain at least 1000 mg calcium carbonate per tablet for this experiment. Calcium carbonate reacts with vinegar (acetic acid) and forms calcium acetate. Calcium acetate is insoluble in alcohols, but soluble in water. When mixed, the saturated water solution of calcium acetate and the alcohol form the flammable jelly.