Virtual Booth

COSer: The Repellent Candle is an innovative and eco-friendly product developed to reduce the presence of mosquitoes and flies while promoting the reuse of household waste materials. This innovation was inspired by daily problems faced at home, especially in food preparation areas, where mosquitoes and flies often cause discomfort and affect cleanliness. At the same time, many reusable materials such as coconut shells, used cooking oil, dried cooking spices, and expired essential oils are frequently thrown away and wasted. The main idea of COSer is to transform these unused materials into a useful mosquito and fly repellent candle. Coconut shells are used as natural and biodegradable candle containers, while recycled cooking oil and paraffin wax are combined as the main candle base. Expired lemongrass essential oil is used as the active ingredient because its strong natural scent is known to repel mosquitoes and flies effectively. The production process of COSer begins by soaking used cooking oil with charcoal to remove unpleasant odours. The oil is then filtered and mixed with paraffin wax in a one to one ratio. This mixture is heated carefully until fully melted. When the temperature reaches a suitable level, lemongrass essential oil is added to ensure the fragrance remains effective. A candle wick is placed securely inside a cleaned coconut shell before the mixture is poured in. Dried cooking spices are added as decoration once the candle begins to harden, making the product more attractive and appealing. When the COSer candle is lit, it releases a pleasant lemongrass fragrance that helps repel mosquitoes and flies, creating a cleaner and more comfortable environment for users. This innovation provides a practical solution to insect problems, especially for small home-based food businesses. In addition, COSer promotes recycling, waste reduction, and environmental awareness among students and the community. This project encourages creative thinking and shows that simple household waste can be transformed into a safe, useful, and sustainable product suitable for daily household use. It also supports science learning, innovation skills, and responsible attitudes towards the environment through hands on activities and real life problem solving for young primary students.