70 K. B. Connolly and W. C. Ralph Fig. 8.4 Aluminum painted with airbrushed Tempra paint, 1.2 mm by 1.0 mm field of view Fig. 8.5 Aluminum with SEM stamp pad, 0.4 mm by 0.3 mm field of view The most recent technique being explored is to use carbon powder, size 0.4–12μm, to create a DIC speckle. This powder is deposited on a freshly painted specimen surface so that it adheres to the surface as the paint dries. Similar to the air brush, there were difficulties with getting proper contrast and feature sizing (Fig. 8.6). However, this technique created a more repeatable pattern than efforts using an airbrush.
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