Refutation of All Heresies (Philosophumena) · Saint Hippolytus of Rome
Ref 2.29.1
But different eggs they display after this manner. Perforating the top at both ends, and extracting the white, (and) having again dipped it, throw in some minium and some writing ink. Close, however, the openings with refined scrapings of the eggs, smearing them with fig-juice.