Table 4.
Second composition of LePera solution
| No. | Etchant | Content | Condition |
|---|---|---|---|
| 1 | Na2S2O5 | 2.0 g | 30 s |
| 2 | Dry picric acid | 5.0 g | |
| 3 | Ethanol (96%) | 100 ml | |
| 4 | Distilled H2O | 100 ml |
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