| Rating | Solver | Clue |
|---|---|---|
| CATALYST | Reaction agents | |
| CATALYSTS | Reaction agents | |
| REACTION | ...festation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame. ... | |
| CATALYSIS | A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is ... |