Products specified for etching Cobalt and its alloys, this includes; some Cobalt-Chromium alloys, 49Cobalt-49Iron-Vanadium, 25Chromium-10Nickel-8Tungsten & 21Chromium-20Nickel-3Tungsten-3Molybdate-1Cobalt & 18Chromium-10Nickel-14Tungsten .