[...]... Table 1 Etching reagents for beryllium-copper and beryllium-nickel alloys Etchant Composition Comments Caution: Poison fumes! Use fume hood γ β β γ Table 2 Chemical compositions of beryllium-copper alloys Alloy Composition, wt% Be Wrought alloys Cast alloys Co Ni Pb Other Cu μ β α β α γ β β γ γ γ γ γ γ γ → → γ → γ → γ Table 3 Chemical compositions of beryllium-nickel alloys Alloy Type Composition,... macroscopic examination of coppers and copper alloys Composition Copper or copper alloy Comments μ μ μ γ α • • • • • • Table 2 Electrolytes and conditions for electrolytic polishing of copper and copper alloys Composition Voltage Current density A/cm2 Cathode Duration Copper or copper alloy A/in.2 α β αβ α αβ Table 3 Etchants and procedures for microetching of coppers and copper alloys Composition(a)... Wrought brasses Composition, % Cu Wrought bronzes Pb Sn Zn Other Composition, % Cu Ni Other Wrought copper-nickel alloys and nickel silvers Composition, % Cu Zn Cr Other Cast high-copper alloy Composition, % Cu Cast brasses, bronzes, and nickel silver Sn Zn Al Other Composition, % Cu Filler metals and brazing alloys Ag Zn Other ... Procedure Copper or copper alloy β β αβ β αβ β Table 4 Electrolytes and operating conditions for electrolytic etching of copper and copper alloys Composition Operating conditions Copper or copper alloy β Table 5 Nominal compositions of copper and copper alloys CDA No Name Composition, % Cu P Wrought coppers Composition, % Cu Other Wrought high-copper alloys Composition, % Cu Pb Fe Zn Other Te Wrought brasses . etchants Table 2 Grades of vacuum hot-pressed beryllium Chemical composition S-65B S-200F I-220A I-400