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Plates of the size used as covers for microscope slides would be ideal. Once the plates are cleaned, handle them only by the edges. Do this by touching the surfaces with the leads from a multimeter. Once you have established which side of each plate is the conductive side, place them side by side, one plate conductive side up and the other conductive side down. This will hold the plates in place for the next step. Place the tape along either of the long side of the plates to overlap 1 millimeter (1/25 inch) of the edges. Place tape over the outer 4 to 5 millimeters (1/5 inch) of the conductive side up plate. Put 2 drops on the conductive side up plate, then spread it evenly over the plate surface. Allow the titanium dioxide to cover the conductive-side-down plate. Before applying the titanium dioxide solution, you may first want to coat the plates with tin oxide. Now you'll treat the 2 plates differently. Place the conductive-side-up plate on an electric hot plate overnight to bake the titanium dioxide onto the plate. Clean the titanium dioxide off the conductive-side-down plate and place it where it won't collect dirt. The dye can be made from raspberry, blackberry or pomegranate juice or by brewing a tea from red hibiscus petals. Do this while the titanium dioxide-coated plate is soaking. Mark the side that doesn't conduct with a plus sign (+). You can do this by going over the conductive side with a pencil or by applying a graphite lubricant. Cover the entire surface. Rinse it twice, first with de-ionized water and then with alcohol. Blot dry after rinsing with a clean tissue.
Obtain 2 equal-sized glass plates. Clean both surfaces of the plates with alcohol. Test the plate faces for conductivity. Apply transparent tape to the plates. Apply a solution of titanium dioxide to the plates. Remove the tape and separate the plates. Prepare a shallow dish filled with dye. Soak the titanium-dioxide-coated plate, coated side down, in the dye for 10 minutes. Clean the other plate with alcohol. Retest the cleaned plate to find its conductive side. Apply a thin carbon coating to the conductive side of the cleaned plate. Take the titanium-dioxide-coated plate out of the dye.