The Girls' Work
Part of the business of the plant was the painting of luminous figures on watch dials, so that they would be visible at night. All the girls who have died and all those who, it seems certain,. are fated to die were engaged in this work. The paint .which they used was composed of a zinc sulphid compound, a solution solution of gum arabic, to make it stick, and a small amount of radium or mesothorium, which made the paint luminous in the dark. The paint was applied to the figures on the watch dials with a small camel's hair brush, and the girls were accustomed to place this brush in their mouths for the purpose of keeping keeping it sharply pointed, so that they could make the very fine strokes required.