| Answer | Crossword Clue |
|---|---|
| OLEIC | -- acid (fat substance) |
| LITMUSPAPER | Acid test substance |
| LITMUS | Substance in acid tests |
| ALKALI | Substance that neutralizes acid. |
| TNT | Substance structurally similar to picric acid |
| NITRIC | ... acid (substance once known as aqua fortis) |
| BORIC | ... acid (substance that turns turmeric paper reddish-brown) |
