| Answer | Crossword Clue |
|---|---|
| photochromy | a former process of colour photography |
| photochromies | PHOTOCHROMY, a former process of colour photography |
| photographies | PHOTOGRAPHY, the process of producing images by the action of radiant energy and esp light on a sensitive surface |
| blueing | the process of imparting a blue colour |
| bluing | the process of imparting a blue colour |
| blueings | BLUEING, the process of imparting a blue colour |
| bluings | BLUING, the process of imparting a blue colour |
