The problem of droplet impact into a thin film h*= 0.43 is studied using a new technique called Brightness- Based Laser Induced Fluorescence. Droplet speeds were generated so that the droplet outcome crossed the predicted crown formation/crown break up boundary. The BB-LIF technique was used in three cases:Case1: both the droplet and liquid were doped, Case 2: the film only was doped to observe the dynamics of the cavity formation, Case 3: Only the droplet was doped to investigate the mixing of the droplet fluid during the impact. It is shown that the cavity formation matches theories by Berberovic et al. It has been demonstrated that the droplet liquid in this case behaves similarly to the evolution of droplet spreading on a solid surface. This is because the cavity is restrained by the presence of the base of the dish during the initial stages of the droplet impact.