Powder for the Skin
If young ladies will use powder, the most harmless is refined chalk, powder is often a protection and comfort on long journeys, or in the city dust. If the pores of the skin must be filled one would prefer clean dust to begin with. A layer of powder will prevent freckles and sun-burn when properly applied. In all these cases it is worth while to know how to use it well. The skin should be as clean and cool as possible to begin. A pellet of chalk, without any poisonous bismuth in it, should be wrapped in coarse linen, and crushed in water, grinding it well between the fingers. Then wash the face quickly with the linen, and the wet powder oozes in its finest state through the cloth, leaving a pure white deposit when dry. Press the face lightly with a damp handkerchief to remove superfluous powder, wiping the brows and nostrils free. This mode of using chalk is less easily detected than when it is dusted on dry.
Source: The Housekeeper’s Friend: A Practical Cookbook