Nowadays, food circulation in society, particularly in elementary schools, is mostly in the form of instant food, that usually contains food additives, such as preservatives, artificial flavors, synthetic dyes, and sweeteners. These food lack of nutritional content to meet children's daily needs. The purpose of this community service activity is to introduce information and knowledge about the dangers of consuming street food around schools that may contain harmful substances such as formaldehyde, borax, and synthetic dyes. Furthermore, the activity introduces a rapid method of testing street food around schools, that may contain dangerous ingredients, including formaldehyde, borax, and synthetic dyes. This activity was carried out in three stages, namely: 1. Module preparation; 2. Presentation; and 3. Rapid testing of food samples. There were 2 steps of activity evaluation, evaluation before and after the implementation of community service activity. This community service activity was held on August 12, 2020, at SDI Surya Buana. The activity was attended by the principal and 40 teachers of SDI Surya Buana. In this activity, a presentation about the dangers of snack foods containing borax, formaldehyde, and synthetic textile dyes was conducted. In addition, demonstration of rapid test for street food samples for the content of harmful ingredients was carried out. The rapid test was applied by using a test kit for formaldehyde, borax, and synthetic dyes. Questionnaires for the participants were distributed to evaluate activities in the beginning and at the end of the event. The evaluation results showed that 100% of the respondents were satisfied after participating in this activity. From this activity, it can be concluded that knowledge about the dangers of preservatives and artificial color for food is needed for school residents. In addition, school residents need to know about the rapid test for preservatives and artificial color present in street food at school.
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