It is difficult to compare the percentage of paint flakes recovered in each colour group between the two surveys as different grouping methods have been employed. Fig. 4 illustrates that Pearson et al. [1] used a cream category but not white or orange, whereas this survey recorded 25% of recovered paint flakes as being white and 2% orange. There were 17% more red flakes recorded in the 1970 survey compared with the current survey.