Any of the following agents may be used:
1. Cold or lukewarm water. Either soak the blood stains or rub them in the water until they turn light brown in color; that is, until most of the coloring matter is dissolved. Then wash the material in hot water, as in the ordinary process of laundering. For stains on silk or wool, sponge in cold or lukewarm water.
2. Soap (for washable materials). Rub the stained portions with soap and place in cold water, either allowing them to stand in it until the stains are loosened or bringing the water very slowly to the boiling point.
3. Ammonia (for washable materials). Use about 1 ounce (2 tablespoon-fuls) of household ammonia to 1 gallon of water. Soak the stains in this until they are loosened and then wash in the usual manner. For old stains ammonia is somewhat more satisfactory than soap.
4. Hydrogen peroxide. Sponging with a little hydrogen peroxide often will remove the last traces of blood stains after the main part has been removed as described in No. 1 above. This agent can be used on wool and silk, provided it does not injure the color of the material.
5. Raw starch mixed with cold water to a paste is efficient for stains on thick materials, such as flannel and blankets, which cannot conveniently be soaked in water. Apply the paste thickly to the stain and brush it away when it becomes dry. Repeat the application until the stain is removed.