Preserving Eggs
Eggs may be preserved by applying with a brush a solution of gum Arabic to the shells, and afterwards packing them in dry charcoal dust.
Gum Arabic described:
http://en.wikipedia.org/wiki/Gum_arabic
Source: Southern Recorder, June 17, 1862 as found in John Hammond Moore, ed., The Confederate Housewife (Columbia, SC: Summerhouse Press, 1997).