To Prevent Mold
A small quantity of carbolic acid added to paste, mucilage and ink, will prevent mold. An ounce of the acid to a gallon of whitewash will keep cellars and dairies from the disagreeable odor which often taints milk and meat kept in such places.
Source: The White House Cookbook, F.L. Gillette
To Prevent Mold on Top of Glasses of Jelly
Melt paraffine and pour over the jelly after it is cold. No brandy, paper, or other covering is necessary.
Source: Things Mother Used To Make, L.M. Gurney
To Prevent Mold on the Top of Glasses of Jelly
Lay a lump of paraffine on the top of the hot jelly, letting it melt and spread over it. No brandy paper and no other covering is necessary. If preferred the paraffine can be melted and poured over after the jelly is cold.
Source: The White House Cookbook, F.L. Gillette