Ketchup is a nontraditional material, but the artist use it in his protest piece against fast food, restaurants because of its ability to

evoke strong emotions and its association with unhealthy food choices. The artist may have chosen ketchup as a symbol to criticize the fast food industry and the negative impact it has on society, particularly in terms of public health. By using ketchup in their protest piece, the artist challenges the viewer to think critically about their own food choices and the larger implications of supporting fast food establishments. Additionally, ketchup's bright red color and sticky texture can serve as a visual representation of the negative consequences of consuming unhealthy food, further enhancing the artist's message. Overall, ketchup in this context is used as a powerful and thought-provoking element in the protest piece.