Circular ring scratches

Figure 17.14 Formation mechanism of circular ring scratches during post-polish roller brush...

The minicell shown in Figure 25.3 may also be used with liquids. The cell assembly consists of a two-piece threaded body, an O-ring, and two silver chloride plates. The plates are flat on one side, and there is a circular depression (0.025 mm or 0.10 mm deep) on the other side of fhe plafe. An advantage of using silver chloride plates is that they may be used with wet samples or solutions. A disadvantage is that silver chloride darkens when exposed to light for extended periods. Silver chloride plates also scratch more easily than salt plates and react with amines. 

---