Characterization of edible silk fibroin coating thickness as a function of dip coating steps and of relative beta-sheet content as a function of exposure time to water annealing. No statistically significant difference was found in the coating thickness for increasing number of dip coating steps. The relative beta sheet content of silk fibroin coating was calculated with a previously reported methodology based on the quantification of the relative beta sheets structures in the Amide III absorbance peak collected with ATR-FTIR spectroscopic analysis.