| Answer | Crossword Clue |
|---|---|
| ARGON | Gas used in incandescent lamps |
| ARGON | Gas in incandescent lamps |
| ARGON | Gas in incandescent lamps, perhaps |
| YTTRIA | White powder used in incandescent gas |
| yttria | white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles |
| yttrias | white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles |
| thorias | white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle |
| thoria | white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle |
| NEON | Gas used in lamps |
| XENON | Gas used in arc lamps |
| XENON | Gas used in flash lamps |
