etching-ground, with which to protect the plate against the action of the acid.
A few minutes after this first operation is finished, the stone is rinsed with water, dried and coated with etching-ground.
The etching-ground is dissolved in oil of turpentine and laid on the stone with a clean ball.
Then it is cleansed with water and covered with etching-ground when dry, as is prescribed for the etched process.
To prepare a plate for etching it is first covered with etching-ground, a composition which resists acid.
There are three different ways of applying an etching-ground to a plate.