Titanium / gunmetal RF build notes.
Most gunmetal programs run as dark brushed PVD over stainless — the titanium look with steel economics — while solid titanium builds are quoted separately as special projects. Either way the card is conductive metal and the antenna needs its engineered path: ferrite or hybrid shielding, tuned to the final thickness, then proven on the real reader. The graphite tone is the quietest in the range, which is exactly why data zones get light panels — grey-on-grey fails the scan test.