Process of chemical etching

Claim 1

A PROCESS OF ETCHING THE SURFACE OF A METAL OBJECT TO OBTAIN AN ETCH PATTERN HAVING A PLURALITY OF ETCH LEVELS, WHICH COMPRISES APPLYING TO AN AREA OF SAID SURFACE A COATING COMPOSITION, SAID COMPOSITION FORMING A MASK WHICH IS RESISTANT TO ATTACK BY CHEMICAL ETCHING SOLUTIONS AND HAVING SUBSTANTIAL ADHERENCE TO SAID SURFACE DURING THE ETCHING TREATMENT, SAID MASK BEING CUTTABLE AND STRIPPABLE PRIOR TO AND SUBSEQUENT TO TREATMENT WITH ETCHING SOLUTION, PROVIDING AN EXPOSED BARE SURFACE PORTION OF SAID OBJECT ADJACENT SAID MASK BY CUTTING A FIRST DESIGN IN SAID MASK, STRIPPING FROM THE OBJECT THE AREA OF THE MASK DESCRIBED BY THE DESIGN CUT, SUBJECTING SAID OBJECT TO THE ACTION OF AN ETCHING SOLUTION, CUTTING A SECOND DESIGN IN SAID MASK, STRIPPING FROM SAID OBJECT THE AREA OF THE MASK DESCRIBED BY THE SECOND DESIGN CUT, AND AGAIN SUBJECTING SAID OBJECT TO THE ACTION OF AN ETCHING SOLUTION.