In the November/December, 2018 issue of the Biblical Archaeology Review there is a brief article on a unique weight that was found in the remains of a Byzantine Church that was destroyed in the devistating earthquake of A.d. 749. This artifact is now on display in the Hecht Museum in Haifa, Israel.
A large stain—thought at first to be dirt—covered its front. A recent analysis, however, shows that the stain was actually made of a metallic paste (of tin and lead) that had intentionally been placed over a silver cross.
Once the stain was removed, it was clear that the weight’s front had originally depicted a cross on Calvary (where Jesus was crucified) surrounded by the Church of the Holy Sepulchre (where he was buried). Two Greek letters—signifying its weight of 6 ounces—appear on its back.
. . . The cross on the Byzantine weight had intentionally been obscured to ensure that the weight could be used even under the new administration. Part of the silver cross had been scratched out—to maintain the same weight—and a stain poured over it.
“Strata: Concealed Cross.” Biblical Archaeology Review, vol. 44, no. 6 (November/December, 2018), p. 13.