| Sample Number | Electrode Details |
| 0 | control: nylon mounted |
| 1 | single silver |
| 2 | single stainless steel |
| 3 | single brass |
| 4 | stainless steel—brass |
| 5 | stainless steel—stainless steel with voltage applied |
| 6 | brass—brass with voltage applied |
| 7 | brass positive—stainless steel negative with voltage applied |
| 8 | brass negative—stainless steel positive with voltage applied |
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