"What is the little blue bottle? Ink?" the lady asked the secretary.

"No, that is stencil correction fluid. It covers up the mistakes you make, when you cut or type a stencil."

"Oh," said Margaret, "show me how it works."

"Well, you place your stencil sheet in the typewriter, set the ribbon at off and whatever you type the letters cut holes in the stencil where the ink may come through. When you cut a wrong letter or word, this correction fluid fills in the hole and quickly dr…