etching ground meaning in Hindi

Examples

1. To begin with an etching ground is laid on the plate.
2. Then the plate is bitten with acid, and the etching ground removed.
3. Callot also appears to have been responsible for an improved, harder, recipe for the etching ground, using lute-makers'varnish rather than a wax-based formula.
4. He also seems to have been responsible for an improved recipe for the etching ground that coated the plate and was removed to form the image, using lute-makers varnish rather than a wax-based formula.
5. The pencil drawing was sent as usual to be transferred by the printer through the rolling press on to the etching ground, but when it came back the drawing was found to have shifted during the process, and the transferred outlines were thick and blurred.