Gelatin is a protein that is derived from Colligan which is found from the bones skin and connective tissue of animals to investigate ability various enzymes to digest gelatin in a group of students set up an essay involving camera film camera phone contains gelatin and appears black when exposed to light but turns clear as the gelatin gets broken down the student incubated pieces of exposed camera film and they test tubes each containing one of three different enzyme solutions Chipsin lipase or amylase as indicated in figure 1 the student records the time it took for the enzymes to digest the The gelatin in each tube turn in the film from black to clear which would be the most appropriate control for this experiment