Pack Size: Not applicable - Solid
Contains: Judea bitumen, dammar resin, wax
Dry extract: 100%
Finish: Opaque matt
Hardness: Hard, not quite as hard as Charbonnel Hard Black Ball Ground
Characteristics: The matt black finish obtained makes etching work very clear
How to Use:
Wrapped in a piece of taffeta which serves as a filter, the ball is rubbed on the pre-heated metal plate. Dab on the ground to obtain an even surface before smoking.
Before applying these grounds, it is imperative that all grease be removed from the plate with a degreasing material. Rinse under flowing water. Pour a solution of vinegar and salt on the plate. Rinse once again. Dry rapidly. Avoid putting fingers on the plate whilst carrying out these operations.
Once the ground is applied and dry, the picture is etched with a hard point in order to expose the metal beneath the ground. The plate is then placed in a bath of acid to erode the exposed metal. Once the required bite depth has been attained, the plate should be taken out of the acid bath solution and dried and the ground removed with the appropriate thinner.
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