| Severe trial |
| Critical step |
| Crucial trial |
| Ultimate proof |
| Proof provider |
| Moment of truth |
| Chemistry exam? |
| Conclusive trial |
| Decisive appraisal |
| Crucial experiment |
| Defining challenge |
| Litmus-paper ritual |
| Decisive assessment |
| Decisive experiment |
| Critical evaluation |
| Conclusive evaluation |
| Merry Prankster party |
| Credibility determiner |
| Chemical moment of truth |
| Moment of truth, in a lab |
| Critical step in analysis |
| Crucial, final proof of quality. |
| It distinguishes gold from base metals |