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| etching (Print made from a plate into which the design has been cut by acid. The process of producing such a plate) | |||
| etching | |||
| nitric acid (aqua fortis); aqua fortis | |||
| acid | |||
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| aqua fortis; nitric acid | |||
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| etchings | |||
| eau-forte: 12 phrases in 6 subjects |
| Chemistry | 4 |
| Communications | 2 |
| General | 2 |
| Labor law | 2 |
| Metallurgy | 1 |
| Municipal planning | 1 |