Water, 1/2 cup, Borax, 1 teaspoon, Alcohol, 1 teaspoon.
Squeeze the lace through this mixture, then rinse in a cup of hot water in which an old kid glove has been boiled. Pull out the edges till almost dry, then press for 2 days between the leaves of a heavy book.
Another method is, to lay the lace on a clean smooth board, and moisten it all over with a piece of black silk dipped in a solution of 1 teaspoon of borax to a pint of warm water. Iron it while still damp, covering the lace with a piece of cloth, or between sheets of thick brown paper.
A method for cleaning black lace is to make a solution of 2 parts of alcohol and 1 part water, and after soaking the lace in this, dry it in the air, and stiffen with a very thin solution of gum arabic.