lunar caustic

Dissolve a couple of drachms of lunar caustic, and half an ounce of gum arabic, in a gill of rain water.

They may be cured surely by paring them down until the blood comes slightly and then rubbing them with lunar caustic.

Dissolve a drachm of lunar caustic, in half an ounce of pure cold water.

After that they took a chemical called lunar caustic and traced out Alpha Kappa Phi on my chest.

The moon became the symbol of silver; and to this day fused nitrate of silver is called lunar caustic.