Soft ground etching method
Abstract
Abstract IN PREPARING A METAL PLATE TO PRODUCE A DESIRED PICTURE OR OTHER DESIGNS, A RESISTANT MATERIAL COVERS THE PLAST AGAINST THE ACTION OF ACID, AND THESE RESISTANT MATERIALS, CALLED SOFT GROUND, ARE PICKED OFF TO BARE THE METAL PLATE SO THAT THE PLATE WILL BE ETCHED BY THE ACID. THE SOFT GROUND IS A STICKY SUBSTANCE WHICH WILL ADHERE TO THE PATTERN ON A COVER SHEET EXTENDING OVER THE METAL PLATE, WHICH IS CALLED THE RESIST. THE PATTERN ON THE COVER SHEET MAY BE FORMED IN MANY SHAPES, AND THE PROTRUDING PATTERN OF SHEET WILL PICK OFF SPOTS OR AREAS OF THE SOFT GROUND WHEN THE SHEET IS PRESSES INTO ENGAGEMENT WITH THE SOFT GROUND BY MEANS OF A MANUALLY OPERATED STYLUS. SUBSEQUENT TREATMENT OF THE METAL PLATE WITH A SUITABLE ACID WILL ETCH THE AREAS PICKED OFF BY THE SHEET AND THUS FORM THE OUTLINES OF THE PICTURE OR OTHER SUBJECT.
Inventors
- 👤 Robert F Nelson
Bibliographic Details
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