| Rating | Solver | Clue |
|---|---|---|
| QUASAR | They all emit light | |
| MELANOSCOPE | An instrument containing a combination of colored glasses such that they transmit only red light, so that objects of other colors, as green lea... | |
| CHLOROPHYLL | ...rmed in the cells of the leaves (and other parts exposed to light) of plants, to which they owe their green color, and through which all ordi... |