Fig. 5
Modelling the application of an acquired pellicle prior to stain deposition on 280-grit ground finish enamel specimens using a variety of acidic polymers, n = 8, mean ± standard deviation. a by application of one layer of acidic polymers followed with 10 layers of tannate stain; b by replacing half of the tannic acid stain component with acidic polymers for the precipitation of 10 layers of stain