The Collaborative International Dictionary
Walling wax
Walling \Wall"ing\, n.
The act of making a wall or walls.
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Walls, in general; material for walls.
Walling wax, a composition of wax and tallow used by etchers and engravers to make a bank, or wall, round the edge of a plate, so as to form a trough for holding the acid used in etching, and the like.
--Fairholt.
Wiktionary
walling wax
n. A mixture of wax and tallow used by etchers and engravers to make a bank, or wall, round the edge of a plate, so as to form a trough for holding the acid used in etching, etc.