Example: air traffic controller
IPC-TM-650 TEST METHODS MANUAL
5.3.3 Immerse in 5% sulfuric acid (by volume) at 65 ± 5 °C [149 ± 9 °F] for one minute to remove the tarnish film. 5.3.4 Immerse in a solution of 25% m/v ammonium persul- phate (in 0.5% v/v sulfuric acid) at 23 ± 2 °C [73.4 ± 3.6 °F] for one minute to etch the surface uniformly.
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