Take a little saffron, put it into an earthen vessel with a very small quantity of cold, soft water, and let it steep till the color of the infusion is a bright yellow. Then strain it, add half alcohol to it. To color fruit yellow, boil the fruit with fresh lemon skins in water to cover them until it is tender; then take it up, spread it on dishes to cool and finish as may be directed.
To color icing, put the grated peel of a lemon or orange in a thin muslin bag, squeezing a little juice through it, then mixing with the sugar.
The White House Cookbook (1887).