For Sore Throat
Take a small quantity of chlorate potassa, pour boiling water on it, and let it stand until it takes up all it will, then add old rye whisky equal to the amount of water you used. Add to this tincture of capsicum until the mixture is pretty sharp, and then it is ready for use. This is good for a gargle in all cases of sore throat and is an excellent remedy for diphtheria, using it both as a gargle and internally. Dose:— One teaspoonful every hour, or when very bad every half hour. Water will only dissolve a certain quantity of potassa. A good rule, is to take a half a pint of water, and when it has absorbed all the potassa it will, pour the water off and add a half a pint of whisky. The capsicum is harmless so there is no danger of getting too much in, but to this quantity I should say add about two tablespoonfuls, which will make it sufficiently hot.
Source: The Housekeeper’s Friend: A Practical Cookbook